FWP - like I said I would recommend John Thomas in PA. His contact info is easy to get online but I can forward it to you if you PM me. There are certainly other air gun smiths, but many people speak very highly of him. His work on my rifle is first rate.
Beware that when the original seal goes it creates a nasty mess in every internal nook & cranny of the gun, and that creates some extra labor compared to a normal reseal so expect to pay a bit more.
I really like the "full power" spring & seal John installed as well. Buttoned the piston, etc as well.
