I don't trust the laser.That is putting too much faith in the centershot being machined exactly square with the riser.I am a tool maker and I know what the odds are with that many mechanical parts.It is probably close but it doesn't take much to throw a laser off quite a bit when you extend it over the distance of an arrow.


I trust Archers Advantage to tell me the spine arrow I need out of most high end bows nowadays.


Your method would require much trial and error that imo,isn't needed.