Here's a trick that I used that will not scratch up the barrel or make you cuss the paint off the wall. I stuck a ball in a CVA and it would not pull out with a puller and it would not blow out with compressed air. So I unscrewed the nipple and replaced it with a grease fitting with the same thread pitch. Then I hooked a grease gun to the fitting and pushed the ball out with a few pumps. You will have to wash the grease out of the barrel, but,hey, it's easy to swab grease out. You can use brake cleaner to do the final degreasing. Lots of luck, Shannon