Just wanted to post a question regarding my BLI M1-b, I have found it to have much more noticable gear noise, (only moderate to high speed) than my other BLI loco (M1-a). I have heard about a difference in quality of units that come out of China than Korea. I lubed it but the noise persists. I know the history of it, I know it wasn't abused so, the reason its so noisy is a mystery. Any thoughts??? Anyone encountered excessive gear noise from other locos? Maybe its not the gear tower.... Any help is appreciated!!