You can use a 24 hour epoxy the others crystalizing. A lot of those glues will do the same and the tips will blow up. Be carefull with any heat on the carbons it can make them week and crack at the tip.

I use a 3 blade broadhead and align the blades with the fletch, so that is why I came up with this idea.

PS i am a rotten speller so just pass over my mistakes.

Do you have a big healical? If so put an arrow on a flat table and use an arrow you can turn the knock, Put a match stick in the knock and make it stright up and down, now knock it on your bow and look down the shat, do the same with on you did not turn the knock. The one that did not have the knock turned is set up to have the fletching hit the riser. I shoot with a flipper rest , i think it is more critical than the shelf so that is why I turn the knock.