[Barry C]

I have just refletched with some ff187. I measured the FOC. My arrow is 29 inch long. The distance from nock grove to balance point is 20 Inches. According to the Easton program that gives a foc of 18.9%</p>

Before with spin vanes the balance point was 20.5 inch from the nock grove to balance point,#which indicated an FOC of 20.6%! I previously made it about 18... I must have been incorrect the first time. I have triple checked everything this time.</p>

Have I made a mistake?</p>