Quoted from herg:

I used 2x Xicon 280-CR10-3.0-RC, 3 Ohm, 10W, wirewound resistors. They're cheap enough that I would suggest getting multiple values to try. I tried pairs of 1-5 Ohms and settled on the 3 Ohm. I added connectors and just plugged in between the motor and harness.
https://www.mouser.com/ProductDetail/Xicon/280-CR10-30-RC?qs=%2fha2pyFaduhQnyZb%252bcSQhYMJQhy5oStP3USc4tFqbPCBhu0X%252bhlkSg%3d%3d
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Quoted from herg:

A properly done crimp is enough, but you could follow up with solder if you wanted.
I have not checked the temperature, but they are chosen to handle the current. We're only talking about 0.5A or so. If we go conservative and say 1A, over 3 ohms, that's 3W being dissipated. They're rated for 10W.

Quoted from snaroff:

Hmm. I actually bought a brand new motor from a reputable pinball dealer and it made noise out-of-the-box. They told me to oil it as well. Your assertion that "Normally end users oiling bearing is the last thing you should be doing." doesn't strike a chord with me. Oiling the motor has worked like a charm for me and my games get lots of exercise.

Quoted from Durzel:

If you're not playing Tron loud enough that you don't hear the motor, you're not doing it right.

Quoted from snaroff:

Bummer. Did you & your friends find/install a higher quality motor?

Quoted from Durzel:

If you're not playing Tron loud enough that you don't hear the motor, you're not doing it right.