Where can i get my cocker feedneck threaded????

[slipperysquid]

Hiya peeps, i have an 03 vert feed cocker, and it doesent have a threaded feed neck, anyone know where i can get it done?
Or can anyone tell me what size the threads are etc on a feedneck so i can go get it done locally? mreally need this doing a i'm sick of messing about with tape/ watching my egg psin around and throw paint everywhere..
Any help greatley appreciated.

 

[Skeet]

They are press fitted into the body.
You could try Dangerousbrian of Belsales, he was doing some...wont be terribly cheap tho...think it was around £50