Tapping Vert Adapter

[Fig]

Ok i need to tap some threads in front of my mag's vert air adapter. It needs to be completely straight, not angled to the left or right at all. Since this is a rounded surface, what method can i use to make sure i drill a hole in the exact middle, thanks.

[bgjkm]

send it into Luke

[Fig]

no thanks, i am capable of doing it myself. I have the tools, i just need to make sure i have a completely centered hole

[Ruler_Mark]

drill press then have the va attached to something that can be held level

[secretweaponevan]

Use a center finder and center drills to start it off.

[Hilltop Customs]

attach it to the rail, use a V block to hold it in place(can be a piece of wood with a V shapped channel cut into it)...you can also use a small drill press vice(good luck getting it perfect though)

anyhow use a level to hang the rail vertical(will basically do it by itself with the weight of the rail, but since u want it perect use a level to double check), find the highpoint on the vert adapter, centerpunch, predrill, drill, tap

a V block will hold a round object much better than any vice and also not mark it all up.....google image search if you cant picture it