Doesn't seem to make a difference if you bottom it. Or at least it doesn't
at my house.

"David S Lawson" wrote in message
...

To make the recess as secure as possible, cut it only just large enough
to accept the closed jaws. Under cut the recess to form a wedge shape
so the jaws do not slip out. mount on the jaws and open them to tighten
against the recess wall. this way you will have almost continuous
contact with the wood giving a tighter hold with less stress on any
point of the recess, with no jaw marks inside the recess. If you use a
larger recess there will be limited contact between the jaws and the
recess walls with the risk of the wood flying off - CATCH!!!
--
Dave Lawson