I've been know to replace this with either Neoprene tubing or RC airplane fuel tubing.Back when I had a majority of Athearn's in my roster, I did this to each and every one of my locos, and I never had a noise problem.Some people just use Pearl Drops tooth polish on the gears, I don't recommend this as it doesn't get to the real root of the problem, which is flash and burrs on all surfaces in the trucks and not just the gears. Sometimes they remain noisy, and that's due to slop in the drive shafts. When this is smooth, remove brushes and springs and re-clean the motor shaft, and areas around the commutator.Reassemble the loco, place on track and see if it not only runs better but quieter. Then while motor is still running, lightly lay a flat file on the commutator to remove any high spots where the brushes run on the shaft. Apply power to brushes, and clean the commutator with a pipe cleaner dipped in any solvent.
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