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you learn something new on here every day
Its just an engineering term used by us old timers Rolf..and to give you a little idea of what it means ..guy from machine shop came up to me and requested I weld up a component for him and said is that gap in there OK Phill..:chin: I said yep no problem with the gap its only a gnats cock IE a little gap..which could also relate to a little dick if you have a dirty mind like the others..
ah ok makes sense now and yes id did wonder tbh