A question - Has anyone ever attempted to grind down the inside of a die cast shell. I have a Lionel Shay locomotive (Westside with TMCC) and the shell is a TIGHT fit! In fact, I believe it is impeding the running of the locomotive. It runs fine with the shell off, but when I put the shell on, it tends to slow down and speed up, basically running non-smoothly. I am not sure if the shell is somehow coming in contact with the motor. I do know that it is a very tight fit when putting the shell back on - more so than any other locomotive I have ever worked on. My thought was to use a Dremel and grind down the inside of the shell to gain some room - anything would help.
Has anyone performed this type of "surgery" on a shell before? I ask because it is easier to take advice before I start than to try and fix a mistake after I finish
Thanks for any help!