I won't claim to have much Jinma knowledge but, I did just look at the exact set up you are working with. I didn't see the gasket it came with but, the cover was off. I didn't look like it would be too hard to make an extra gasket out of a rubber gasket material from an auto parts store. Lube the gasket with a little oil prior to installation and it should come off easily on disassembly, without damage, ready for re-use. I'm sure Tommy @ Afforable will have a knowledgable suggestion.