Originally Posted by Davyboy
Air cylinder. As you can see the the charging end is threaded and appears to screw into the cylinder. The central hole is fitted with a sprung release pin which when struck by the firing pin releases the air to fire the weapon. The 2 outer holes I believe would have had a special tool ( not unlike the kind for removing the blade from an angle grinder ) I will manufacture one in the next couple of days. I do not want to do any pressure testing until I can see the state of the internal cylinder. I will be replacing all internal seals with modern equivalent.
Any comments greatly appreciated.
Sounds like your going great guns at it.
Looking at the end of the air chamber you obviously need to manufacture a hand pump with a pretty big internal thread on it, to screw on the end of that cylinder.
That does seem a bit odd too as the wider the bore on the pump the less pressure you are going to get into the chamber, Which is why most Victorian hand pump internal bore was around 3/4" in dia.
Saying that, the original pump bore cylinder could well be 3/4" in dia, logic would dictate that the internal female threaded end of the pump must have been something in the region an inch? with an external diameter of ? 1 1/2"
thats a pretty big connection!
I make the valve seal from black delrin, you will never need to do that job again.