These clamps work great. I've used the left and right helical, as well as the straight clamp. Used along with the Bohning Jig, all my arrows perform with expected flight charicteristics and I'm satisfied that the clamps are a very good product and an excellent value for the money spent. I'd recomend this to any one wanting to build their own arrows.
I was tired of depending on archery shops fletching my arrows, so I decided to invest in a jig. At the time I did not have the extra dollars for the jig that I wanted, so I purchased the Bohning Pro Class jig. For the cost it works well. I recommend that you set the jig based on an already fletched arrow. It can be quite tricky getting it set, but once it is set, fletch away. I have done a dozen of my arrows in 2 nights after work.