I just bought this coil nailer used and it worked great for a few coils then suddenly it stopped working and air is passing through the top. I opened the top and the plastic seal in the middle of the air vent has crumbled into pieces. What should I do? I can't find a specific rebuild kit online.
I need this gun working so I can finish my roof!

Thanks but there are a thousand parts there. The problem is I'm not sure what part I need. I'm a pretty handy DIY guy but those drawings are hard to figure out. Also most every part I click on is discontinued or not available. I circled the part I think I need. It is discontinued. I circled it in yellow.