is this one with a telescoping cylinder, that has a couple chrome sections that come out from each other?
I would not tell you to try and repack this type cylinder, since the size of the sections makes it pretty difficult and the alignment is pretty critical to getting it all back together. I would tell you to send that cylinder as a complete unit to Able Machine in Taylor, South Carolina (thanks Larry m) who sort of wound up specializing in this type of cylinder.