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The machine shop at Plumstead was far more modern than that at Nortons/Shellys, having been re equiped by Alfred Herberts in the late fifties, & so maybe tighter tolerances on machined parts. One change that comes to mind is the oil pump speed was doubled, & the rockers pressure fed. They changed the balance factor, but it didn't seem to improve the vibes. Also, the barrel spigot was deleted & the head machined to suit.
