You're one of those too??-- I tho't I was the only one..... Interesting fun question what does the location of the node mean? My guess is their location tells us something about how the tip wt and fletchings etc affect the arrow dynamics.. Fun to do a node location on a shaft before adding tips and fletches and then after the arrow is built to see if it changes???? but a so what answer I don't really have. Just more fun with the physics of arrow flinging.. I wonder if marking the top of the arrow at both nodes so it can be seen as you draw would constitute a sight violation for BB??But then again, I'm the guy who couldn't hit the floor if he dropped an arrow from his quiver, .
PS I did this the other day-- found the node on a shaft then after point was added and the node shifted towards the point, did not fletch the back end but did add a nock it shifted back a bit- so based on this very antedotal test how you build your arrow might well affect nodal points- now what does that mean????