Greg A ripsaw to cut down the forearm (top view) from muzzle to just before the approximate location of the front of the lock moulding. small right angle cut to remove forearm slab piece, then continue from lock moulding to wrist, twisting the saw so that you form enough flare for lock tail / wrist transition. Your offset dimensions should be your usual same as if you band sawed it. Mark Silver's DVD shows this very well.
Broke