pinnion instalation

[Desslok]

I purchaced a nice pinnion puller from my hobby shop and used it to remove the pinnion from one of my motors to install on a 180.

I used a vice and slowly squeezed it pushing the pinnion on the shaft. well looking at the other end of the motor there is a dimple in the metal<not big but visible> the comm got pushed to hard.

what is a good method of installing a pinnion that will avoid this problem in the future ? should I heat up the pinnion and put the motor in the fridge trick ?
any suggestions would be apreciated..
thx

[Bash_N_Thrash]

When I switched my pinion gear to my MZR-130-AA-BB I drilled out the hole slightly. I used a #47 drill bit to ream it out a bit. Install was still plenty tight and I used my pinion puller/press to install it.

[RC 2NR]

You could try some lubricant, that might help a little.