Quote from: wagnera361 on June 07, 2024, 10:40:59 AMThe waddle is synchronous with the wheel revolution.If you look at how the wheels are secured to the axles, it is quite possible that one wheel is not perfectly at 90 deg to the axle. The nylon bush does allow a bit of latitude in the fitting.
Put the loco upside down [careful with that whistle casting - use a lump of styrofoam to support the cab roof,] and apply power. You will probably see one (or more!) wheel wobbling as it rotates. Grab a felt-tip pen and use it to mark where the wobble is greatest. (Hold it close to the wheel and let the wheel touch it as it wobbles.)
Once you figure out which wheel is wobbling, you can pop off the center screw cover in the middle of the wheel, and tighten the screw, or remove the screw and push the wheel into alignment, or just try to rock the wheel into alignment.