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Sorry not to update this in a while.  I spoke to a Norvil mechanic and he explained that Norton built the swing arms to be about 0.001" larger in diameter on the right side (though he said while the larger diameter is spec'd to be on the right side it is sometimes on the left) so that the bushings can be driven out from left to right easier.


He went on to say that if there is not enough interference withe the right bushing/swing arm interface but the difference is less that 0.0015" that one can just use some bearing loctite to secure the bushing.  My machinist ended up putting a light knurl on the bushings and use a little bearing loctite and the bushings went in with adequate interference.


Just a couple tricks in case anyone else finds them in the same boat.


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