I a having problems getting the drum to rotate on my lionel 140 signal. Also, when it does rotate, the vibration tends to unthread the screw holding the wigwam. If i make the screw too tight, the wigwam will not swing. I received this used so I am not sure if I am missing any internal parts. I did put talc on the drive washer fingers, but it did not help. Also, I looked at the assembly diagram, and I think I am missing a washer between the coil and the drive washer, but I am not sure. 
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