you would be better off just bidding on one on ebay for afew dollars and replace the whole engine. being the motor is froze up from the battery acid, i doubt that it is any good if you can possible turn the shaft get some contact cleaner from radio shack and spray it all over the inside and shaft. good luck if that doesnt work your best bet would put it on a display shelf or toss. those sets werent that exspensive and the motor alone if available probably would bemore than the set cost. they are ebay quite a bit.