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Instead of solder, depending on the chassis configuration, many of us rely on the trusty old hot glue gun.

I may have some AJ's mounts,i will look through the parts bin and see.
Some of the old strombecker cars used the chassis as part of the mount.
Bob

Hot glue!..mmmm. interesting!.. very possible. Thanks for the tip!
but, btaylor, I am hoping you have some A J mounts !

And a new question for ya all, one of these pictured motors runs slow and heats up real fast. What could be wrong? and what can I do to correct it, .. if any thing?

Take resistance measurments across all three poles of both motors. Chances are that the readings for the poor running motor will be lower and that might be caused by the commutator being shorted. Try scraping out the slots in the commutator with plastic from some blister pack. Flush with contact cleaner and read the ohms again. If the readings have increased the motor will probably run OK. It is possible that there is a short in the motor windings, the only fix for that is to rewind the armature.

The magnets need to be re-zapped (which, in turn, magnetizes the motor frame). Those old iron slug motors don't hold a charge for very many years.
You can search the 1/24 sites for somebody to do it. I did that a few years back, but for the life of me can't remember who it was!
- or -
1. stick some neo's on the motor frame (careful of the polarity). Sometimes they help to remagnetize; mostly they act like a can-type magnet.
2. replace the iron magnet with neos. Stick a bunch together using steel shim (or cut up a steel can if you can find one) as spacers if need be.
Remember, with those motors it's the magnetized frame that makes the armature spin.