The delicate drive shaft tip, a spline consisting of two fragile nubs, keeps wearing off by a fraction, and so begins to slip in the drive hub. The rapid wear appears accelerated by the locomotive going around the 18 inch radii of a micro layout. I’ve greased the ends without making any difference. I’ve replaced the shafts multiple times, but they consistently fail. The longest one has lasted is 30 hours of continuous Running, at exhibit, the last two replacements lasted 10 seconds and ten minutes, respectively, before The spline sheared. Is there a way to replace the junky little drive shaft with a metal one? Or better yet replace the entire shaft From tender to locomotive with flexible RC fuel tubing, or replace the whole motor and shaft? I have an upcoming museum exhibit, and no working 1860’s type American in service. Typical Bachman: pretty face rotten guts. I sorely wish they would upgrade the mechanicals to match the fine injection molding. Will post photos later.