To h2rider and oldair.....I apologize for the belated reply guys. Thank you for your replies. Please forgive my ignorance but I'm a bit confused . Looking at the parts on the JG website link that h2rider posted, are you saying that the leather inner piston washer at the left fits inside the leather cup piston seal? It isn't clear from the schematic view. Any further info is greatly appreciated. I realize this airgun is not worth repairing but it has a lot of sentimental value to it's owner.Also...Is there any chance I could modify and use a modern silicone piston seal instead of leather?Mark B.