Doc,I dry fit my parts,get my broadhead oriented as I like(horizontal)and mark the shaft at the back of the blade.In my case I have an aluminum footing so I make a small"witness mark"on the footing,behind the back edge of the blade
When I mount the broadhead on the adapter,get it seated and spinning true,I double check against the mark to make sure the blade's orientation hasn't changed.
It is also important that the adapter stays tightly screwed in or the witness mark means nothing.For this reason,anytime I turn the broadhead past the mark,I have to go round again,clockwise,till I get on the mark.This assures not backing out the adapter.
I then set them aside while the epoxy finishes curing,making sure nothing can bump the head.After,I engrave a small number on the broadhead and footing with a cheap engraver.This may sound like too much but it takes seconds.If I want to remove several broadheads and use field points or blunts or to refletch,I can get the broadhead back on the arrow that it was spin tested and oriented for.
Without a reference mark,it is too easy for something to get moved before you set the arrow down.If you look closely,there is a small,silver,hash mark in the aluminum footing,just behind the blade.