turning down the motor shaft?

[tashpop]

sorry guys, i never got to taking a pic. it is one large magnet. if i can't turn it down to 1/8th inch, i really don't see much of a need to turn down the motor at all. i can easily open the bor of a 5mm pinion to 6mm and just use those. my problem is finding anything 5mm or larger that matches 32p gearing. mike has a 16tooth, but all this work for 20mph doesn't set well for me. i'm still researching my options for changing over to mod 1 gearing which will allow me to find 5mm pinions with the correct gearing that i can drill out to match.

unless somebody on the boards has something around 20+ tooth 32p they can sell me?