Thanks for the information. I did go ahead and purchase replacement shafts from Bachmann, and have installed those on one of my Shays. They seem to be working fine so far, its just too bad that I had already purchased the NWSL parts. I wish they weren't so hard to install, though, because it really would be much better to have steel gears rather than plastic. I may consider contacting shayfixer if I have any further issues in the future.