Jerry, I know you've posted this before but I forget the answer...On the Tapps, did you say that you index/dot the shaft on the stiff side or neutral plane? And if it's the neutral plane, why is it?
We put the statically tested stiff side between the hen vanes ONLY because there is a false perception that it needs to be placed there. It could also be placed in line with the cock vane
The fact is static and dynamic spine appear in the same orientation or more accurately stated they are in the same plane
When an arrow flies it develops ONLY two spine deflections, the stiff plane and 90 degrees from the stiff plane the neutral plane
If you were to test an arrows deflection dynamically you would find the stiff plane dynamic deflection when oriented at 12 and 6 has that same deflection 22.5 degrees to the right and left of 12 and 6
When the neutral plane which is at 3 and 9 has the same weaker deflection 22.5 degrees left and right of 3 and 9
So an arrow in flight has only 2 dynamic deflections 360 degrees around the shaft the stiff plane and the weaker neutral plane
If you ever hear someone refer to the first bending plane they are wrong. What they are referring to is the natural bend in a shaft.
The stiff plane can be in line with the natural bend, fact is it is most likely in line but not 100% of the time
Folks who refer to the bending plane believe you can press down on a shaft on rollers and it will roll around to the natural bend
The flaw in this concept is it can also roll to the static weak point on the shaft which has nothing to do with dynamic spine
I will do a video soon, maybe today