Originally Posted by what barn door
I believe that a chap called Dave Welham is the man to go to if you want a rifle re-regulating or modifying to have a reg when it didn't before.
I must state that I have never used the chaps services myself and have no connection with him, indeed I don't even know how you get in touch with him, maybe google.
Having said all of that, maybe you should follow up the advice to get the original ones serviced first and see how that works out?
All the best
Dave Welham is Airmasters88 ......
Details below via Google....
Business Name: Airmasters 88
Business Genre: East of England, UK
Business Address: 13 Tring Road, Edlesborough, Bedfordshire, LU6 2EQ
Business Phone Number: 01525 220076