I'm thinking of buying the taps (or tappers, what's the word?) today later, and trying to tap the holes myself. I'm gonna use M3 or M4, not sure yet, gotta find good bolts probably allen bolts. I found a set of tappers for approx. 6 Euro, think I'm gonna go for it...Knowing me, I'll try to tapper the holes before I try to practice on something else and screw somethin up...
But I must try it...