I used a 3/16 drill bit(which is not as big as 5mm) and than would use a small bit in my drimmel tool to make the pinion fit on the 5mm shaft. But I guess you could use a 5mm drill bit?

Thank you,
Promod

I use a 13/64 bit..and it works great....
a 25/128 would be better if you can find it....

Promod, I remember... I have about a million pinion gears... all trial and error drilling.. sometimes it's good.. .sometimes it looks like sh*t....

so u guys are sure that there will be enough space for the grub screw? Ok will let you guys knw as soon as i go to the machine shop and let the pros do it themseleves! if it doesnt work ill have to open up my engine and make the shft thinner.

it's way better than shaving the shaft....