First, locate the bridge using 1/16" brads so that it doesn't move while you are trying to get it clamped. Some people drill these through the saddle-slot but since I use the tie-through bridge, I drill the outside string locations.
For clamping, I use two pieces of wood with threaded rod at each end wider than the lower bout. The top piece has three holes drilled and threaded for appliance-feet (1/4-20). the center foot is brought up "snug" and the outer feet are tightened down on the wings of the bridge. You do not require any great force to hold the bridge as the glue sets.
Bob
