I made this little jig to help with the problem. It is easy to
make and may be useful to someone else.
The finished jig with a wedge in place.
The parts with sizes marked. The main board is 9” by 3” by ½”.
The underside showing the vice mounting block.
The jig held in a vice.
All wooden parts are beech but any stable timber will do. The
bolt heads were machined down to fit in the counter bored holes.
Sizes are not critical but the thinner you get the holding bars
the narrower the wedges that can be held.