James, I drilled the hole for a good slip-on fit and put a drop of Super Glue in it.
Gary, I've had the skirts at the bottom crack and had to cut the end off short in a couple of cases. That's what makes the smaller bores so challenging. I had better success rebating the end of the rod allowing a thicker skirt that's still not any (or much) bigger than the rod diameter. I didn't do this for the .45 and had to shorten it to a "button" when it cracked. They all turned out pretty good with .45 through .62 the easiest and nicest. None of the tips have broken after installation as they retain enough bone for great strength.