Tuning Fx impact leak

My speed dropped, i feel air coming out from here
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"sniperlabyo"you put loctite if so let it cure overnight, or teflon tape on the set screw, you can remove it --- it doesn't hold pressure, only when fired.

the set screw is there to prevent the valve housing from moving to insure the transfer port holes on the housing and the action are properly lined up.
I didn't put anything. Ernest are you to busy to tune this impact?