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Re: 8 mm motor shaft to .5 drive shaft adaptor
Find a piece of 3/4 round steel. Drill it with an 8mm drill through then from one end half way through with a .5 in drill. Make this thing about 1.5 to 2 in long. Drill and tap for four 1/4-20 set screws. Grind flats on your shafts where the set screws contact them and you will not need the keyway.
Bruce
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