Originally Posted by Delta 15
Ah, that's an ingenious solution
It is, and I have one in my Box O Tricks.
However, a note of Caution: The clamshell will only work in situations where the rip is over 2" and less than 3" long. Soooo, if you have a 1" tear, it's out with the knife, ouch! If it's a 4" tear, you're screwed!
Having thought about it, a DIY, FOC solution is at hand for all of us. Make up a range of various sized 1/4" plywood twinned pieces, backed with rubber (inner tube) or hypalon and mated with a woodscrew or slotted bolt with a fixed nut (for the faint hearted). Insert the back piece in the rip, cover with the outer and screw or tighten together. A screwdriver or diver's knife will be required. You may feel happier with a retaining cord from the backing plate through the outer plate :-)