Help with Freewing B-17 retract problem

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Hi guys. I have the FW B-17 from several years ago. On the last flight one of my retracts quit working. I have disassembled and inspected the unit and it will not run while assembled but the motor will spin when no load is on it. Obviously finding a replacement is very difficult so I am asking if anyone has a suggestion for a modern set of retracts that might be a decent replacement. I don’t mind cutting a little foam. Any suggestions for repairing or replacing would be appreciated.
thanks