I use fer-L-tite. I would occasionaly have a head come off in a 3-D target untill I started super-heating the head with a propane torch when I put it on then dipping it in cold water. The heat expands the head, then the cold water shrinks it. I've not had a head come off since, sometimes it takes some work to get them off when I want to, such as when changing from field points to broadheads. Be carefull doing this with hunting points, don't let the flame touch the cutting edge or you'll ruin the temper. I don't heat broad-heads as hot as field points.