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I think perhaps TomU means the sleeve gear bearing (see gearbox photo) as that has a 'rubber' seal?


(Personally, I wouldn't use a seal either side of the mainshaft bearing because the lifter mechanism needs lubrication and wouldn't use one on the inside of the sleeve gear bearing either as the gear acts as a shield.)


[URL unfurl="true"]https://www.accessnorton.com/NortonCommando/shielded-mainshaft-bearing.25637/[/URL]


Edit: Also

[URL unfurl="true"]https://www.accessnorton.com/NortonCommando/roller-shielded.24353/[/URL]


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