Use fletch-tite glue, I think that bohning makes it. its kinda flexible which prevents a lot of tearing from the shaft yet sturdy enough that they are hard to come off. They cut right off with an arrow stripper as well when it comes time to fletch again. I always use wraps personally, so I just glue directly to the wrap after wiping it down with alcohol. If I'm fletching directly to the shaft, I always us the finest scotch-brite pad you can find and gently scuff the end of the arrow. Be careful though, if you have an arrow with a real glossy finish you can take the finish off with it. But I've NEVER had a fletching come loose, I've cut them which you cant prevent, but they always last me until i decide to change colors or wraps.