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We noticed that the palstic couplings are tapered inside, proably was done to make them more moldable, but makes them less than ideal for transmitting high torques.
Hence we are making steel couplings made to our own design to go on the end of the motor shaft, and putting a 5/8' pinned shaft ito the end of it eliminating the plastic stuff.
As mentioned before make shure the lefthand screw is in place and is the right length, the standard drill screws sold for chucks is shorter than the ones form FIRST. also I would recomend high srength loc tight on the motor and screw thread also. Let it cure over night before using it. Also tighten the coupling and screw by putting the drill motor in low and holding the fan in the motor with a small screw driver while clamping the motor mount down.
This worked well for the older drill motors and should work again.
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