Working on mounting new rails on my General 350. Need to drill the angle iron to match existing threaded holes in the table top. Don't have a set of transfer punches but what I do have are lot's of short pieces of threaded rod so I made this (see photo), I'll call it a transfer screw. Just found a short piece of 3/8" threaded rod, chucked it in my cordless drill, ground one end to a point then cut a slot in the other end for a slotted screwdriver. Clamped the rail in place, fed the transfer screw into one of the threaded holes on the table top from the other side under the table, cranked it tight, repeated in the second hole. Crossed my fingers and success, the point left a clear mark on the channel. I'm sure I'm not the first to use this but I haven't seen it used before.
Transfer screw.jpg