RE: Best way to test spine with one arrow?
I'll point out that SAV is talking from the standpoint of a right-handed shooter. If you shoot left-handed, the opposite applies with the nock right/left.
I prefer bare-shafting , mainly because I don't care to mess with paper and I can do it before I fletch, but you can paper-tune a trad bow. Back up a few feet to allow for the paradox to straighten up some--maybe 5-8 feet. Get your nock-set right first--this will be indicated by a high or low tear--then work on the side to side tear. Basically it's the same thing--with a right-handed shooter, a tear to the right means too much spine, a tear to the left means too weak. Using both methods probably wouldn't hurt.
The fletching won't have time to correct arrow flight at less than 10 feet. Further back, you will get a false reading because the feathers have begun to straighten it out.
Try both and decide for yourself. If you talk to some of the top target shooters, some prefer one method, some the other--obviously both will work if done correctly.
Chad