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Old 09-08-2009, 01:11 AM   #70 (permalink)
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How hard would it be to have the shaft machined for a woodruff key? If you use a flat key (not a half moon/crescent) of the 1/4" variety, it should hold up to any load you can put on it.

Obviously, you'll still need to weld the pieces of the coupler together.
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