These shops come to mind,Howdy All;
I have called, emailed and texted just about all the mainstream shops and individuals this past year, and no one is equipped or willing to repair my Winchester .22 cal (Hy-Score 815) air pistol.
I have an 816M (recoilless) .177 cal that I bought in the late 70s. She is still doing well. The 815 lasted one shooting session and the seal gave out. It was bought from a shop and I took it to mate with my 816M.
Baker Airguns: Air Guns, Repair, Parts, and Supplies
We are a full service authorized airgun warranty repair center specializing in airgun repair and restoration of popular brands such as Crosman, Sheridan, Benjamin, Daisy, and more.
GTA also might be a source who might know of a possible repair
Airgun Forum | GTA International Airgun Forum | 17,332+ Members
The Gateway to Airguns forum is the oldest, largest, and most active airgun forum & knowledge archive. Used internationally by airgun enthusiast and industry professionals to discuss and share all things related to airguns. From vintage airguns to the most modern PCP airguns.