Not to be a killjoy, but I don't think your plan to leave out the set screw is a good idea. There is not a lot of surface area to drive on with a key and keystock is not that hard to start with. I have seen a lot of key failures caused from loose set screws, and often times the keyway in the shaft and the coupler are damaged as well. It's your call, but I think you should find a better fitting coupler.
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Almost all my driving is done 1-5 miles at a time.
Best short trip: 2.4 l/100 km, 3.9 km
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