Does the magnum have a press on pinoin gear, or is it a set screw? Either way, you'd just have to pull the pinion gear off, remove the spring, remove aluminium spacer.
Then, take one of your old motors, measure with a set of calipers from the back of the motor to the front of your pinion. Mark this line on the long series motor, and cut the shaft at that mark. If the pinion gear was on with a set screw, you might have to grind a small flat on the shaft for the set screw to sit on. If its pressed on, you'll have to find something to press it on with, DO NOT hammer it on.
Its definitly worth your wild if you found a used one at a good price to convert it IMO.
Hope this helps.
Ryan
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