I do have my older brothers' #41 Army Gas Turbine that has a broken shell and a halting motor. I can only do so much with the shell--if I replace it, it isn't their engine anymore--but I do want to go through the motor and get it--uh, grinding--again, just like it used to do.
Related but not the same: someday I intend to strip the CC out of my ailing CC engines and replace the guts with simple rectifiers/reversing units so that I can run them conventionally. For now, they limp along (when they can be coaxed into it).