I'm helping a friend of mine install a conversion kit, A Ford c-4 to a 1935 Ford flathead. The question is this: When we bench test the starter or even when we had it bolted to the engine for a test fit, the starter drive would not disengage after it turned the flywheel, the starter drive wouldn't go back to the end of the shaft it rides on. Does the engine have to start to make the drive return to the original position? This is the original flathead starter. Dan