The fitting is a bit too long. I wanted to shorten it by 1/2 in. Is it possible? I need the cone shape to move back 1/2 in and I can cut the tip off. But the cone shape would not move at all when I putting a wrench over it and hit it with a hammer. I thought it would just slide back but it wouldn't. Is there a Grove inside there holding it or what. I dont want to pound it too hard and damage it and won't seal when I put it back. Is there a way to move the cone shape back so I can shorten it?