just put a piece of paper between spur and pinion and push the motor towards the spur and tighten the screws. now pull out the paper and it should not tear. perfect mesh
Radek
V4 D8 - RX8, XERUN 4168SD
F1-09 - Tekin RS Pro, 17.5t Redline, 2S LiPo
Sakura Zero S - LRP, Saturn 20T, 2S LiPo
*EX-10 Eurus*