I have an old engine hoist with an old long ram cylinder on it. No identifiable markings on the ram for sourcing parts by brand. The handle operated plunger at the base is leaking. I took it apart and found some sort of deteriorated packing material inside, under the screw in cap that the plunger passes through. I can't find a kit for it after searching on line for a while. There is a local shop that specializes in bottle jack repair (believe it or not) but he hasn't returned my calls and may well be shut down for this virus thing. So, I'm wondering if I can make my own replacement packing type thing or seal.I'm not sure how much pressure is involved here so I'm a bit skeptical of making my own but, what the heck. I've got nothing to lose at this point. I was thinking of sandwiching a piece or two of regular grey gasket material in between two pieces of maybe bicycle tube or rubber roofing material (all cut to fit with gasket punches and such). The piece that screws into the base and the plunger passes through should compress this hodge lodge in the bottom of it bore/sealing surface. Am I waisting my time? Sorry for no pics. I'll try to take some tomorrow if it will help. I've watched videos and read threads and all that. This jack is a bit different from the modern designs in those things I've seen but the principle is the same.