Anyone use a straight clamp for fletching and just offset it to get some helical? Can you do rights and lefts with one? How do they work for broadheads and are they noisier?

More helical would be noisier because of more wind resistance.
 I use a slightly offset straight fletch. With the old JoJan I have I can adjust it for left or right. If I'm not hand fletching my cane and hardwood shoot arrows I use the JoJan.   Pat

Yes, I do. I offset left wing feathers to the left. Jawge

As long as you can get the foot of the feather to evenly contact the shaft, it will be okay.  Like others have said, less noise, but also less stable - you are reducing the gyroscope effect of the helical.

I do straight with my flu-flu's... I also have some arrows done the sameway.. They still fly good

I use it a lot, mostly for sanding down the quills of split feathers and splicing.

Killdeer  

It doesn't take a whole lot to stabilize your arrow if it's well tuned to your bow. Straight offset will do just fine. In the overall scheme of things, the helical fletcher is relatively new.

it's amazing how much an arrow with diagonal fletch will spin. right or left

Jim, I have used one since I began my traditional journey. They seem fine with offset andstraight clamps. Fly well, stabilize BHs well. My woodies for hunting are pretty silent too.