Re: mooring a 900lb, 14' boat w/o spring lines?
"mooring" is not limited to tying to a mooring bouy. But obviously the OP is asking about mooring at a dock or a piling, perhaps a dolphin, or a combination of same. Let's call the place he ties up "the slip."
Whether one uses a spring line is not a function of the size of the boat, but the configuration of the slip. As you know, the object is to tie up so no part of the boat touches any part of the slip's structure, through any tide height or wind direction. Typically, the larger the boat, the more lines are needed to hold it off the various structures of the slip. That's where the spring lines are more likely to come in.
When contact cannot be avoided, or for temporary and supervised mooring, fenders, rub rails, etc. come into play, but it is not the best practice.
So for small boats, you can usually manage to configure your mooring lines with just the bow cleat/eye and the two stern cleats/eyes, adnyou can sometimes run a spring line off a stern cleat to a midship's cleat on the dock. No one here can advise you how to moor your boat in your slip unless they have been there.
