Welcome, Elias! We're getting to be quite the international community here on TheFret...
I don't know anything about wiring a '51, and don't own one, so I couldn't tell you about the tuner hole size, BUT,
if Robert and our knowlegeable members can't help you, here's another resource to check out: http://www.instituteofnoise.com/squi...um/default.asp .
It's a forum for people who have been bitten by the bug to modify the '51...
Good luck!
Guitars:
Fender 2006 MIM Fender Stratocaster HSS in 3TS
Ibanez RG 570 with a bridge Invader
ESP M II Deluxe with a Tune-o-Matic bridge
Eleanor, the magical, mystical Road Worn wonder Tele
Blackstar HT Club 40