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The first regrind size is 1.745/1.7400 (-0.010") so you might have to go to second undersize 1.7305"/1.7300" (-0.020"). Note that it is important to keep the 0.090" radius see manual section C20.

 https://www.classicbike.biz/Norton/Repair/70up_Commando/70upCommando.pdf


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