Hello! Just recently got into HO trains and my first full set was The Challenger item #00621
After a couple loops around the track it completely stopped but I could still hear the motor running. Next I took it apart and put the drive shaft back together. After my repair I put it back on the track and now it's running but with a very noticeable clicking/vibrating sound. I still have a feeling it's something to do with the end of the driveshaft (the smaller cylinder piece) I'm wondering now if this piece is glued or not. The gears work fine and so does the motor. I've also noticed a bit of white stuff around that cylinder piece as well, that's why I think it's glue. Has anyone experienced this issue and does anyone know how to fix it?