This happens quite commonly with older Spanish guns, exactly the same happened to one I owned years ago, at the time I was still working 'on my tools'
I am a toolmaker, so I just took it to bits and made a new one from 'silver steel' dowel bar, that worked fine and was still ok when I traded the gun 6 or so years
later. Anyway in 'today' money' I reckon that any gunshop 'fixit' man could put your gun right for about £50.
Best of luck, and get some snapcaps.
cheers for the advice. he took it back yesterday and the owner rung today and had it fixed. he also stood over the gun and