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I thought that's what I said. I did not say the barnes were bore riders.
Another way, the major diameter is groove dia. The minor diameter is supposed go be smaller than the bore so that the tops of the lands are not engraved. This reduces pressure as above and behind the grooves as well as the tops of the grooves is the only part engraved. This, of course depends on the bore dia.
Above, I called the shank, the minor dia.

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Re Reding it, without the aide of rum I see my stuff up.

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Rule303 - agree whole heartedly about the rum!
Cheers

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