Thank you 44Dave, I have tried 6X.75 but they are too big, the old nipples measure 5.5mm,Idon't know the thread pitch . I will put the cylinder and a wrench in my pocket when I go to the next gun-show.The original nipples are so bad up to .008 difference in length, that there is one the hammer will not hit.Replacement is imperative.[/s..QUOTE
Here are two different length
Revolver-M5.5 x .9 Th. x .501 Long
Fits Reproduction Colt & Uberti Pistols
(6 Per Package)d,
5.5 x .9mm Th. x .485 Long
Italian &Uberti Revolver