I have a Greyling with a straight clamp I will sell for 20 bucks
Or I will let one of my Bitzenbergers with Hight wing clamp go for 50 bucks. I also have a brand new left wing bitz clamp and nock reciever I will let go of for 20 dollars extra.

Does the degree of helical seem to have any effect on arrow flight through a whisker biscuit?

if your looking for an ok jig get a jo jan if yah want consistancy time after time get the bitzenburger the jo jan works ok but i prefer my bitzenburger yah get what yah pay for they have both of em on e-bay