Have you done any Bridgeport Boss5 screws, or do you already know the details on that screw? I do not have them out, for the dimensions you ask for. But I would like to get an idea on a rebuild cost. No bad noises or crashes, or anything, just a slight backlash.....maybe not even the screw.
But do you have a general cookie cutter rebuild program?
zcases <at> frontiernet [dot} net