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Don't kid yourself, dragging your feet would work better than a Commando rear drum.
Sonny Angel once explained to me that the Norton rear drum was introduced in something like 1928 and didn’t need to be updated accordingly to Norton management circa early 1970s. This was with a wry grin in the way only he could do it. I sure miss him.
The Commando was tremendous fun but for me the end came when I discovered the cause of the incurable primary case leak was the depth of the O-ring groove deepened around the curved ends.