[Gordon Steadman]

Yup, Loctite 638. Get the pinion a good but not too tight a fit, a drop of Loctite over the end nearest the shaft and slide it into 'perfect' position! I tend to use motors at the more powerful end of things - NSR Kings etc. and haven't had one let go.

Soldering is messy and, if you are not careful, gets the motor a bit warm. I see people using gas guns to solder around motors and I would be nervous of that. Maybe it's an old wive's tale but I thought heat and magnets didn't mix!