Seeing as it's an old Harry Quinn I'll asumes it's a steel fixed cup your having trouble with. Some times this works, take lge hammer and give face of fixed cup a couple of good hard hits. This will sometimes release the seal of rust/contact between surfaces of the threads.
Seeing as it's an old Harry Quinn I'll asumes it's a steel fixed cup your having trouble with. Some times this works, take lge hammer and give face of fixed cup a couple of good hard hits. This will sometimes release the seal of rust/contact between surfaces of the threads.