The picture with the broken wedge, is from not supporting that area. That is why I recommended putting the lock plate on that side and putting the fixed jaw on the lock instead of the wood. Not a good idea to put the jaw on a slender piece of wood and not think it won't slip off and break or crack this piece.

I went back and just noticed that the broken piece is on the drilled side. The only way the break here could have occurred is that the pin going through the hole was not attached to the fixed jaw and it slipped off. If the pin was long enough, the jaw would not be close to the piece.

Last edited by JDW; 01/22/13 07:52 AM.
David