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Personally I would throw away any you have with a set screw. Find the kind that clamp solid to the shaft so the splines do not keep working against each other.
or maybe drill and tap the other side for 2 screws and loctite them? i believe that style of joint has less play in them than the ones i use but the one thing i never liked about them is that they don't clamp down and have to be welded on one side. also there is no rebuilding that joint so disposable like the others.