FX Can’t fill back my fx king!!

Well here I’m again feeling really stupid. what I learned! don’t mess with you airgun before ask the profesionals.
Here is the story I replace the white plastic disc on the huma regulator pushed the stem rod back Then I pressurize the gun shot a few rounds and it works really nice. I lost one bolt please if anyone knows the the size, please let me know. I really appreciate.

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