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Installing Perko Fender Locks

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  • Installing Perko Fender Locks

    I've searched about drilling into fiberglass and understand what has to be done. They recommend #8 screw ss. Just wondering how long they should be. Thanks
    2010 Larson LX1850, 3L, MPI WEC
    2010 Honda Ridgeline


  • #2
    Re: Installing Perko Fender Locks

    You could use 1/2" Stainless screws. Fiberglass does not spread much so the drill hole needs to be bigger than you would use on wood. (sorry, I don't remember what size I used) Maybe get one extra screw and use it to 'tap' the holes before you install the screws. Use a bit of sealant in the holes when you install the locks. If you want you could go to a 3/4" length, you won't need longer than that.
    Use a larger drill bit to countersink through the gel coat to stop it from cracking when you put the screws in.

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    • #3
      Re: Installing Perko Fender Locks

      rallyart, thanks for the advice. Really appreciate it....
      2010 Larson LX1850, 3L, MPI WEC
      2010 Honda Ridgeline

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      • #4
        Re: Installing Perko Fender Locks

        It helps to set your bit on the fiberglass and run fast in reverse to make a little dimple in it- makes a huge difference in how much the fiberglass chips. 3M sealant is a must.

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        • #5
          Re: Installing Perko Fender Locks

          Thanks, the boat is a year old & I get paranoid about drilling into it..
          2010 Larson LX1850, 3L, MPI WEC
          2010 Honda Ridgeline

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          • #6
            Re: Installing Perko Fender Locks

            You should have seen my wife's face when I started drilling 4" holes in mine with zero hours on it. She loves the heater now though.

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            • #7
              Re: Installing Perko Fender Locks

              I am sure a lot of people have had success with fender locks, but not me. I installed some on a pontoon boat and they were broken during the first season. They did see a pretty good load. While rafted to larger boats, wakes from passing boats would move the rafted boats up and down a good bit. The rolling of the rafted boats would be somewhat out of phase and the fenders would get pulled by the rolling motion. These are the ones I used. Click image for larger version

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              • #8
                Re: Installing Perko Fender Locks

                I would never trust those things except in VERY limited use. Maybe if you trailer and only use fenders while waiting to exit the water, or possibly if you only tie up to a dock once in a while.

                When I worked in a boat store some years ago we had customers come in all too frequently asking for 1) their money back 2) replacement fenders and 3) money towards fixing the damage to their boats. And yes, we eventually stopped carrying those stupid things.

                Much better to simply use the existing cleats on the boat or add new ones (especially nice pop-up ones!!) if need be. Some folks tie to bow railings but I wouldn't do that myself... Too easy to have a fender catch under the dock and fold the rail.

                What's your docking scenario(s) and can you post a picture of you boat?
                1989 Sea Ray 300 Sundancer
                Twin 260 Merc I/Os
                Irondequoit Bay, Lake Ontario NY

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                • #9
                  Re: Installing Perko Fender Locks

                  Good advice about how to mount them....but don't. Very poor design....I wouldn't own a set.

                  Buy 2 pairs of deck cleats to match the ones on your boat. Mount them midway between the existing cleats. Its ok to use screws and not thru-bolt them, just remember they are for fenders, tying up tubes while you are anchored, or tying on a fish stringer, not meant for mooring.
                  2009 Starcraft 14' FLSS & Yamaha 25
                  2005 SeaDoo GTX 4-Tec 155
                  1984 Stingray SVB190SS & Mercruiser 3.0 Liter 140
                  1964 Sea Nymph 14R & 1970 Evinrude Sportwin 9.5
                  1960 Mulray 100 Dinghy, equipped with Beaver Oars
                  1952 Lyman 15' Mid Steer & Evinrude Big Twin 25
                  63 Outboards: 1919-2008, representing 11 manufacturers
                  -------------------------------------------------------------------
                  Member ACBS, LBOA, AOMCI

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                  • #10
                    Re: Installing Perko Fender Locks

                    I like mine just fine. Yes I've drove off with a couple of them down a time or two. Had to go hunting for those. But I think they're really helpful after you get them rigged that you can toss a fender to a swab and have it in the right place at the right height. Mine stay on very well overall. I like em'.
                    90 Carver Montego 21.5 (23') "Lady Minna" (yes a name change in honor of our fallen Labrador. Poseidon understands.)

                    In the immortal words of Hunter S. Thompson:
                    "Life should not be a journey to the grave with the intention of
                    arriving safely in a pretty and well preserved body, but rather to skid
                    in broadside in a cloud of smoke, thoroughly used up, totally worn out,
                    and loudly proclaiming "Wow! What a Ride!"

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                    • #11
                      Re: Installing Perko Fender Locks

                      The rear cleat is too far back, when you hang the bumper its about useless. Have a mid cleat. Been using inside handle or bimini tube which I know is not good. Usually boat inland lakes, however when cruising the St Lawrence River/1000Islands area, docking on the river at Clayton,NY, the boat can get hammered to the dock.Click image for larger version

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                      2010 Larson LX1850, 3L, MPI WEC
                      2010 Honda Ridgeline

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                      • #12
                        Re: Installing Perko Fender Locks

                        I've successfully used those Perko locks for several years. And I keep my boat on a slip (no lift) all summer. One time one of the brackets broke out the bottom, but it was my fault for tying the boat too tight, and pinching the fender tight against the side of the dock. Otherwise, I've lost no fenders and have had no trouble with them. They are also very handy for quickly hanging fenders for temporary "parking".

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                        • #13
                          Re: Installing Perko Fender Locks

                          Boats NEVER have enough cleats, and it makes good sense to add them for your fenders. You can position them precisely where they'll do your boat the most good, and they serve double duty anytime you need to add an extra line. Buy them the same size as your midship cleats and you gain a lot of versatility.

                          My .02
                          John and Linda
                          Escapade III
                          1992 Carver 26 Command Bridge
                          Twin Merc Alpha 4.3 LX

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                          • #14
                            Re: Installing Perko Fender Locks

                            My boat had the Perko fender clips on it when I got it. I wasn't very impressed with them.

                            Ended up removing them and filling the holes in the gelcoat.

                            Best kept secret in boating is the Folbe Quick Tender fender clips. You can use as many as you like and wherever you like. They clip over the edge of the windshield or on a cleat and allow you to instantly adjust the height of the fender depending upon the dock or boat you're tying up against.

                            http://www.folbe.com/index.php?main_...huul2ll3jkvr40

                            Pic of my boat with the Folbe clips:

                            Any opinions expressed above are worth exactly what you paid for them!

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                            • #15
                              Re: Installing Perko Fender Locks

                              End of season last year I bought fender locks and new fenders. Haven't installed the locks yet. They are different from the ones pictured above. They are the style that has a plastic button that attaches to the fender line and then drops into a slot to hold the fender. Regardless, after reading the nay-sayers, I think I'll skip the fender locks and just tie the fenders on to the cleats. The thought of the fender getting stuck below a dock on a rough water day and ripping the fairly light duty lock and screws out of the glass is just too realistic a situation to risk it. I'd rather shread the fender than damage the glass.
                              sigpic 1985 Bayliner 1600 Capri Cuddy, 1965 MFG Niagara Custom. >> MFG Video<<. >> MFG Project<< >>Bayliner Hard Top Project<< >>Bayliner Repower Project<<

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