[#Rotor]

Originally posted by g.l.amour
what dia must the hole be, to be able to tap m4 thread in; 3 or 3.5mm?

btw, got some measures from here;
http://www.fullermetric.com/Dimensio...ill%20Size.pdf

what does the coarse and fine mean?

http://www.galaxydrill.com/drillsiz.htm

a good one...