SDP-SI Module 1.0 SS Pinions

[What's_nitro?]

I bought some SS Mod 1 pinions last week and got them in the mail today. Is it just me, or do they have a REALLY SMALL set screw in them? I don't even have an allen key small enough! I might try and drill them out and tap it for a 4-40 set screw; or do you think grinding a flat in the motor shaft will be enough? I know some of you have bought these pinions before. Have you had any trouble with them spinning on the shaft? Seriously, who thought it was a good idea to use a 1.5mm (diameter) set screw in a Mod 1 gear? Does anyone even make a 0.5mm allen key?