This may be a long shot, but I'm getting desperate.  I have 3 Liliput locos from the Austrian production (2 BR05s and a BR18), and all are out of action because the collar-like thing on the motor shaft that connects the motor to the gear assembly has come loose.  I've tried Superglue, Gorilla glue, cursing, etc. and nothing works.  Does anyone have a suggestion?