M_Boats: Transom Ladder

I am installing a three step transom ladder, Windline TT-3X on my M15, same ladder as installed by Bob Eeg. Attached to the bottom rung is a nylon strap with a snap buckle at the end. When the ladder is stored, it is folded up with the bottom rung uppermost. The nylon strap goes from the topmost rung over the top of the transom and fastens on the other side. I have not seen any pictures of how the buckle is fastened to the cockpit side of the transom. I would appreciate a description of how the buckle is fastened or any pictures of the installed buckle. I know that I can count on this most knowledgeable group to come up with an answer for me.. Murray Wood M 15 524