Winchester Model 600X Break Barrel Disassembly Help

Need help from you airgunsmiths. Brazilian-made Winchester Model 6ooX. I bought this for my youngest daughter when she was 6, so 17 years ago. Guessing it had been in the store for a few years, probably at least 20 years old. Been sitting for about 15. Have been told the seals in these were leather, supported by the fact the manual says to lube the seals with motor oil. It will cock and fire put doesn't push the pellet out so I assume the seals are the issue. What I can see of the spring looks good, no rust, not broken. Teh seals in the Brazilian guns were apparently a different size than the Turkish (Hatsan I think?) made ones and I can't find them. Brian at Veradium Air said he'd do custom seals if needed so I thought I'd take it apart. Disassembly was pretty straightforward until now. Housing for the trigger assembly is welded to the compression tube. Easy enough, remove one pin and the trigger and spring come out. Safety mechanism is a bar, remove the spring for that and it slides freely. Attached to the housing by the pin I haven't punched out yet, which also appears to hold the sear in place. It's all connected to the plastic cap with safety switch you see on the end and that's where the fun starts. I can't get that dang cap to budge. If you look at the last pic from underside of the barrel you can see the seam where the plastic cap hits the cap for the spring. You can't push on this plastic cap to compress the spring because it's right up against the compression tube and it's not going to move. So, it has to come out for me to get the spring compressed so I can remove the pin you see in the side views. Put rag around it and tried to pull with pliers, didn't budge. There's no lip or anything for me to tap it out other than hitting on the linkage for the safety mechanism and I'm loathe to do that. I there a trick I'm missing? I might have to tap that other pin out and remove the safety bar and sear from the housing. in the end but there's enough play there now that I should be able to get the plastic cap to at least move and test that theory, but it won't. You can see the sear in the R side view. I hope I don't have to remove that pin because getting the sear and spring back in that housing is probably going to make me use bad words. But I can't find out until I get this plastic end cap to budge! Thought I'd ask before I resort to the, "Get a bigger hammer" theory.

Edit: Oh, and the small indentation forward of the plastic end cap is where the trigger spring rides. Looks like it's actually molded into the cap for the spring, the pin goes through the compression tube assembly between the plastic end cap and that indentation. And then forward of that is the spring guide.

600X_Trigger_Tube_Rside_Sized.jpg


600X_Trigger_Tube_Lside_Sized.jpg


600X_Trigger_Tube_Underneath_Sized.jpg
 
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