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I installed this ladder to enter the side door on my pontoon boat. I drilled two holes in the upper bracket for 5/16” stainless steel carriage bolts with lock nut and washers behind them. The head fit the keyhole slot in the ladder perfectly. Add a washer between the head of the carriage bolt and the bracket. Slip the ladder on and tighten the lock. The connection is solid. I’m big, 240lb and it doesn’t budge when I climb up. Simply unhook it from the carriage bolts before you leave where you are swimming.