Superblend is just marketing speak for barrelled rollers and seems only to be used within Norton circles, in Norton twins it means a crank can go like a skipping rope and the rollers do not dig into the bearing surface. The R&M 6/MRJA30 had barrel shaped rollers and was a development of the std roller bearing, I do not know if it was especially developed for Norton but as it was copied by other bearing makers very quickly it was probably just a normal development that by chance was available in time for Norton. The problem was there before the Combat but the Combat made it much worse due to the power and its free reving nature.
Murray, the roller bearing that was orginally fitted was a std for the time roller bearing, the problem was with the straight rollers running in flat bearing surfaces combined with a whippy crank unsurpported in the middle the ends of the rollers dug into the bearing surfaces and destroyed them.
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