Hi Folks been a while since I posted one of my creations, thought I would share this silly little do-dad with ya.
It is a reference point for adding a missing vane. I found that trying to eyeball where the clamp and vane meat was terribly difficult, and you never really knew if the nock had been rotated out of position.
this is how I use it:
First I mounted a vane on an arrow that is the same size as the arrow that is missing vane. I then make a counter clockwise click of the arrow. I then set the pointer to match the pristine vane placement. Once I have done that I can place an arrow on the jig with a missing vane and it tells me if the nock is still in it's original rotation. if it's not I can adjust accordingly and add the missing vane back on in perfect registration. Well close enough for the youth arrows anyway. It's a lot closer than trying to eye ball it. I used an old dove tail sight I had laying around so it is completely adjustable for fat arrows and low or high profile vanes.
Perhaps it's a ridiculous idea but I find it rather useful.