I heat the inside of the broadhead with a propane torch, melt some Ferrul-Tite and smear a little on the taper, and push the broadhead on firmly while holding it with pliers. Rotate the arrow while pushing to spread the glue, and spin the arrow on its point to check that it's perfectly straight on the shaft. If not, apply a little more heat if necessary (it may have cooled some by now), rotate the head with the pliers, and spin again. Repeat until the head spins true. If the point taper is straight, it will usually work the first time. A broadhead has to be on straight to be accurate.