24 hr epoxy. Screw your adapters into your arrows and crank em down as hard as you can by hand. Use BLUE thread locker or "Loc-tite". Now, apply epoxy to adapter with a toothpic, push the broadhead onto the adapter. Begin balancing and spinning, checking for wobble. I use one of those cheep-o plastic cutting boards and I push the heads on hard, pressing the tip of the broadhead into or onto the cutting board. Once you get it to spin perfect or as close as you can with no wobble, CAREFULLY set the arrow aside. After about 2 hours, go back and check the spin one more time for insurance. I've had them sort of swell out of whack on me before, but hardly ever. If you ever want the broadhead off the adapter for whatever reason, it will come off with some heat. Hope this helps!