The winding leads on the knee lift motor on my Gorton mill are toast, probably from soaking in oil for too long. I have located a similar enough (same mfr, voltage, rpm, frame) used F56 frame motor, but it has a keyed shaft, and is 3/4hp vs the 1/3hp with spline shaft. Can I just swap out the armature? Will it have the power of 1/3 or 3/4hp? I'm thinking it would consume power of a 3/4hp motor, but maybe not have the power of a 3/4hp motor? Shipping the existing motor out for repair + return shipping would cost about the same as a used motor delivered, and take much longer.