Widening endpoint hole for jack

[AcornHouse]

Sorry if this has been covered before, but what method do you use to open up the end pin hole in an Allen cast tailpiece for a pickup jack? Reamer? Step drill? Other?

Thanks.

[MANNDOLINS]

I use hand reamer with tailpiece mounted...touch up burrs with small file.

[Mandobart]

If its a real tapered endpin so there is a through hole, use a reamer. Size depends on the jack you're using. If you need to enlarge the brass tailpiece, use a stepless drill bit (http://m.harborfreight.com/3-piece-s...not%20provided)
If you have a screwed in strap button instead of an endpin use a brad point drill bit. Again, size depends on the jack you're using.

[Michael Lewis]

Reamer.