Re: how do i remove this prop guard?
Before you begin to tear up something. Check various online stores for propeller locks. If you find a brand that looks like what you have then you could do a search for the manufacturer and possibly get a key or whatever to get it off.
iboats lists the "McGard Prop Lock" and that manufacturers website is at:
http://www.mcgard.com/Home/MarineProducts/PropellerLocks
Since iboats carries that brand maybe you can get some help from them.
I have noticed that McGard is the only brand of prop lock that I have seen listed anywhere. Maybe McGard is the only company that makes a propeller lock.
If yours is not that brand then maybe do a google or whatever search for prop locks.
This is probably like it is with pickup cover locks and locks on many other items. There is probably only a few keys, maybe even one key to fit all of them.
This assumes that you checked everywhere in the boat for the key. Places like the glove box if you have one, the float type key chain if you have a hollow one or maybe it is just hung up somewhere on the boat out of sight. If I had a prop lock I would probably hide the key under the engine cover or under the steering console up and above the back of the instrument panel.