[45Auto]

You don't need a press to put a pinion on a 775 or smaller motor.

Any decent vise will do it easily.

Make sure the rear end of the MOTOR SHAFT (very important!) is resting directly on one jaw. Use a piece of aluminum or steel scrap between the shaft and the vise jaw if the electrical terminals are hitting the vise jaws.

Place the pinion against the other vise jaw and line it up with the front end of the motor shaft. MAKE SURE THAT THE ONLY POINTS OF CONTACT WITH THE VISE ARE THE REAR OF THE MOTOR SHAFT AND THE PINION. SLOWLY tighten the vise until the pinion is where you need it on the shaft.