Issue with AA Alfa Sport PCP pistol

[Rakoon]

I need someone who may advise me how to fix the air leak from the breech / transfer port of this pistol.
What I can do with it is to unscrew the rear end nut at the end of the receiver, just under the rear sight. And the hammer, hammer spring and valve stem all came off. I can see the white teflon packing at the very bottom inside. I try to clean it up, and after that install all the parts back, but no success. It's still leaking slowly. I am thinking to pry out the white packing at the bottom inside, but not successful. I can't take it out.

If any one has had the same issue with the AA Afla pistol, please share with me how it can be fixed.

Your advice is much appreciated.

Thank you,
Rakoon

[Rover]

While at the dentist, I begged an old "nut-pick" tool from him. I've found many uses for it.

[rmca]

Amazon or ebay also works... and less expensive!

[Gwhite]

I think the internals of the Alfa are similar to the Tau-7's. You want to be VERY careful fishing out the firing valve with hard sharp tools. If you put a scratch in the wrong place, it will never seal again. The procedure for the Tau's was to use a brass wood screw to pull out the old seal. That destroys the seal, so you want to make sure you can get replacements.

[Rakoon]

Ah, those are good advices, guys. Thank you so much, cheers.