A lot of people here have a scissors crutch. I think that Roger in CA has a photo of his at:
http://groups.msn.com/RogerConrad/shoeb ... hotoID=181
I replicated the paddle crutch. I took an old canoe paddle and cut out a little tab on the end of the paddle to fit in the slot under the floorboard (DSI).
I took a cheap-o sliding door chain lock, receptacle end, and cut it in half widthwise, and attached it vertically to the transom coaming right above the floor slot, with the cut end up. This made for a little receptacle for a short and wide brass screw, in the paddle, to fit into.
All this sounds very complex, but it's not, and it looks simple and elegant. It's nice to see a varnished paddle sitting in the boat.
Maybe a pic is worth a thousand, etc.
Carlos