This is the jig from the top. Adjustments can be made by lossening the wing nuts and sliding the nock holders left or right. When fletching, the nocks are inserted into the round barrel looking parts. There is a cross piece inside that keeps the nock oriented correctly and there are detents on the outside that are indexed for either 3 or 4 fletch's dependiong on which way they are inserted into the jig. Mine are a little loose from years of use, I have to be carefull that the nock holders are in line.
Closer view of adjustments, you can see the cross bar in the nock holders here.
View from the front, adjustments can be made here as well. You can see I have it set a little right of center (looks like left from this side) When using the striaght clamp I like a little offset, that is accomplished with the adjustments. For helical, I only adjust it enough to make sure the feather/vane stays in contact with the arrow along it's full length so that the glue/tape holds in it place properly
Clamps: LW Helical on the left, stright on the right. I swear I also had a RW helical clamp but it was not in the box where I normally store the jig.
I will normally align all the nock holders to the same position and set the arrow(s) in the jig. I will then place a feather/vane in each clamp, making sure they are all in the same postion (dist from the nock). One at a time I will apply glue to the feather/vane and apply the clamp until all six have been placed. I usually give it 20 minutes or so for the glue to set before removing the clamps, rotating the nock holer and repeating the process for the next row of feathers/vanes.
I only use the helical jig for my traditional arrows. For these prefer tape over glue for attaching the feathers/vanes. Because there is no set time for tape I just use one jig and quickly attatch each feather to the arrow. I will also apply tape top all the feathers/vanes prior to starting. That actually takes longer then fletching the arrows.
When done with either method I apply a dab of glue to the ends of the feathers/vanes to make sure they stay down.
I believe JoJan made a single arrow jig as well. If you keep your eyes open you can find these on eBay occasionally, that's where I found mine. My dad has one he bough when we were kids and he still uses it today. He is a competitve shooter, he has fletched many 1000's of arrows I'm sure by now. It's a worthwhile investment if you do much shooting at all.
If I remember the next time I refletch I'll take more pictures of the actual process.