And then throw the arrow away because you got it to hot.[

] I had someone hunting with me last year and staying at the house. He said he had to turn one of his heads. I said you can' t do that with carbons. He said, " I do it all the time" . He therein proceeded to melt down a carbon. It' s still in my garage.
It' s not necessary to line up broadhead vanes with your fletchings. If you feel you must do it do what Len does. When he makes up his arrows he puts a broadhead in the insert, places it in the arrow and spin tests them before gluing so he gets the truest straightness and alignment possible. He marks the shaft and broadhead, puts on the epoxy and inserts it. He twist it around 2 or 3 times to even out the glues before aligning the marks. I would think you could do the same thing for aligning broadhead blades.