Danny,
your 'useless and irrelevant' information about the Vengeance guns is anything but. It is what makes these a/c come alive as this information is usually missing from the formal histories. On a similar vein on the RAF Hercules tanker a broom, or at least the handle was a no go item. It was used by the loadmaster to dip the fuselage tanks as when the tanks were refurbished the sight glasses seem not to have been similary treated. Not a fact to appear in any formal history. So please keep your 'useless and irrelevant' facts coming please.