Boiling it weakens the bone quite a bit.
When I did my first one this year the nose peice came off to but it slipped right back into place. I never even glued it on.

This year shotgun my brother shot a decent 8 and he shot the buck like two feet away. He was along a fence line and the buck ran right to him on the other side. The buck was about ready to jump over the fence right onto my brother but then my brother quickly got up and shot the buck. Dropped the buck instantly because he shot it in the head, through the neck, and somewhere into the vitals. I caped out the skulls and there was a big whole in his nose and then the back of his head was blowl to peices. I thought it would be a cool euro mount with that hole in him so I boiled it out and the whole entire skull fell apart.