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Rob. TO answer your question, the O.D. of your rollers is a neat 3 inches and it's 7/8 thick the counter bore allows for the bearing as well as a thin steel plate that goes onto the pin first. it is the bottom seal. the pin has an eccentric where the bearing mounts that allows you to adjust the play out of the steering between the rollers and the cam plate. There is also a spacer at the top of
the roller (between the bearing and the clamp block) that also acts as the bearing top seal.
Can help with more detail if you wish.
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Bluebell
Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
Dodge WC55. 37mm Gun Motor Carriage M6
Jeep Mb #135668
So many questions....
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