Originally Posted by MD
I tried to install a 52T spur in my TT01E and ir rubbed the chassis. Do you have to reduce the thickness of the spur to make it work?
Yes, of the Tamiya spurs that I've tried, the 61,58, and 55 work directly. The 52T spur coming from the F201 car requires 2 alterations to make it fit into a TT01.
1) the shaft diameter on the 52T spur is 6mm (I think) while the TT-01's axle is goes over is 5mm (I think). I initially wrapped electrical tape over the axle and poked a hole through it to put the holding pin through. Cluedgy, but it made the spur fit snug; had to trim away excess tape outside of the spur to prevent rubbing and drag. Another guy here put a 6mm spacer into the spur and drilled a 5mm hole. I don't remember how I did it but last week I noticed that I had a nice spacer that fit snub and clean.
2) The outer wall on a 52T spur where it goes over the axle is too wide for the TT-01's chassis where it cradles the spur and axle and so the 52T spur rubs. I put the 52T spur up against my belt sander and carefully thinned the outside wall. Too little and it will still rub, too much and the wall will loose its strength to have the spur stay on the axle.
If the thing wasn't so embedded into my car right now I post a picture. But where it was rubbing just sand that part thinner.
To write this post I scanned posts 7xx-871 where several of us here were trying to figure this out. Struck by how much trial and error and mistakes we made, but after bouncing ideas off each other this was the method that worked.