What kind of washer is used on this bolt? Is it some sort of copper "crush" washer like what's on an oil pan nut? As always, thanks F-Chat! Pen
Found it! The little bastard! Anyway, my bleed valve here is not knurled like on the radiator, it's a 13mm bolt, so for those of you bleeding this valve, be careful not to lose the washer when you loosen it!!