I recently posted that I was looking for a small part from MTH. It was the plastic bearing from the front truck of my Berkshire locomotive. After ordering a whole new front truck I decided to take a close look at the bearing from the other side of the truck, after looking at the CRITICAL dimensions, I went to the shop and using my Bridgeport and a piece of black Delrin I was able to recreate the missing bearing. It works flawlessly and when the new truck gets here I will just have an extra. Took about an hour so it was probably not cost effective but it was fun!