In that top pic you'll see the fairly thick lip the bb has, the ones that need spacers I think have a thinner lip, whether that indicates a different marque or model of bb or just a different production batch I'm not sure.
@M_V started
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In that top pic you'll see the fairly thick lip the bb has, the ones that need spacers I think have a thinner lip, whether that indicates a different marque or model of bb or just a different production batch I'm not sure.