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By the way, the things with the 'coil spring and graphite rod' are the motor brushes. They run in contact with the copper ring (which is split into poles), hence the deposit on the copper ring. The motor will not run without them.
My guess is you shorted across the motor terminals and blew at least part of the decoder. The motor would probably survive that.
Adrian
My guess is you shorted across the motor terminals and blew at least part of the decoder. The motor would probably survive that.
Adrian