Why don't you get a jig thats adjustable? The bitz has two dials, one at the front and one at the rear that will change the degree of offset. If you want helical, get a helical clamp, left or right. If you want straight, get astraight clamp. If you need different clamps for different set ups, get a spare clamp. You can get a used/refurbished one for around $40-45. Ebay is a good place to look, or pm me for a link to a thread on another forum wheresomeone was selling refurb bitzenburgers for $45.