Vic's excellent article (including engineering drawings) suggests that the clearance between crosspin and circle on the lump be between .0005" and .0015" and that there should be no visible clearance between the breech end and the standing breech. Clearance between the action flats and the barrel flats is listed as .002"-.004". That is why you can often see a bit of light there but the clearance between the barrel breeches and the standing breech (or "detonating" as it's charmingly called in the UK) should be "the thickness of smoke" and you really should not be able to see light.
Last edited by Erik330; 06/08/10 01:05 PM.
