Here is an excerpt from when I posted about the drill fixture I made awhile back. It looks kind of crude but works fine.
"I made mine out of a piece of scrap steel and some 1/2-13 short bolts. Drill the center out of a few bolts which form the drill guide bushings (small one for pilot then larger up to helicoil tap drill size).
Make a center plug out of whatever to match the id of your port and countersink it and attach it to the bar with a flathead screw.
Drill an 8mm or 5/16" hole on the other end to slip over an existing stud. This can all be made on a simple drill press, but a lathe is helpful to drill the 1/2-13 drill "bushing" bolts."
