Thanks Ken
What size is the table on the 645?
what I am thinking is going with a 6 inch to have something to grow with - since it is too big for the T slots, i am thinking of attaching a subplate (say 1/2" material, 7.5" x 12" (table is 8 by 30) with 4 cap head allen screws (counter sunk to be flush) into t-nuts in the slots to bolt the plate to the table - then drill and countersink flanged bushings from the underside (or a captured hex bolt at the right distances to then mount the vise
if anyone has done this and has thoughts on a layout, hardware etc, that would be great
thanks