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You can see the small setscrew that adjusts the trigger bears against that pin.
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The front of the trigger blade and the screw. So you have to take the gun out of the stock to adjust the trigger?
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Pushing out one pin.
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But the trigger is still connected...
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Pushing out another pin...
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And it's still connected.
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Final pin.
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And out comes the trigger group.
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Milling a tool to take up the spring load.
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Just a notched tube.
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Pushing it in.
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Not far enough though...
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Lengthen the notches.
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Now push that pin out. Again, it looks like the pin on the Superstar.
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Really a thing of beauty.
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After all that, this is the amount of spring preload.
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The spring and guide.
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The guide and washer.
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The piston.
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I don't know what that yellow stack is...
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An o-ringed piston head. Easy to replace.
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The piston head fits into the piston via a slot... Looks a bit worn and the head was loose.
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The piston head stem.
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A steel washer and a stack of poorly punched yellow plastic washers, likely a replacement for what should be a rubber or leather washer.
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Lots of washers. Well if you don't have a lathe...
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The piston head.
Anyway I have to clean it up now, make a new washer for the piston head, lube and reassemble, then do the stock work...