Originally Posted by
Jim C.
The red rubber hose looks crispy to me, it might be leaking from a crack somewhere on the hose causing pressure loss
I'd check that first. Especially near the nipple at the bottom of the piston.
The pneumatic piston isn't that complicated, yes it should be clean and smooth inside the bore of the cylinder and dry,
the piston should be as well, it's a loose slip fit brass on brass. Without seeing in the cylinder bore better it looks like there is a
pivot joint on the piston, remove the cylinder from the board and tilt it slightly to remove or pull straight down.
Clean the bore of the cylinder with lighter fluid ( naptha ) or isopropyl. On Packard shutters I have, I've polished the piston and the bore
with some metal polish, cleaned, then applied some teflon spray followed by a light buff after the spray dries.
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