I agree with Kirk , try rotating the arrow on the nock, It should tell ya if it's stronger on one side than the other.

Like Black Velvet- make a rough spine tester.  Two nails on the side of my shed 28" apart, pint plastic soda container full of water, hang it down from the arrow middle.  Measure deflection.  Pretty close to a normal spine tester, but don't care too much for true numbers as I am looking to compare shafts with each other.

I agree Steve. Good for a comparison test but I believe a true test is done at 26" and an exact 2#.

Quote from: Ronnie Newell on May 29, 2022, 12:36:13 PM
I agree Steve. Good for a comparison test but I believe a true test is done at 26" and an exact 2#.

I believe you are mistaken bro.... The 26" span is for wood arrows with a 2# weight.  Carbon shafts are measured with a 1.9 # weight at 28" span for true deflection value...    Kirk

Do what the others said about rotating that nock. You might be surprised. I was when I had same issue. Certainly the easiest first step.
Then report back, Please.

Kirk, you are more than likely right about me being mistaken...happens real often these days.   I wasnt the brightest kid in my neck of the woods before I got old.  Lol.
Bob, I havent had much time to mess with it but I did shoot it a couple of times with nock feather out and it still did it.

Quote from: Ronnie Newell on May 29, 2022, 04:10:17 PM
Kirk, you are more than likely right about me being mistaken...happens real often these days.   I wasnt the brightest kid in my neck of the woods before I got old.  Lol.
Bob, I havent had much time to mess with it but I did shoot it a couple of times with nock feather out and it still did it.

No worries mate... Did you watch that video i posted on the last page? Andy is an exceptional arrow builder and has some good info. I shot my first Trad 3D shoot, with the first longbow i ever built with him & his wife years ago. Great guy. Does beautiful work.      Kirk