a) Both the R and L indexers can be used for a straight fletch. The indexer will just change the offset of the feather.
b) The indexer will give you the proper offset for the clamp. If you use the opposite indexer it will offset the feather to the opposite side. I have heard of this being done before but, I do not know how this would affect the performance of the arrow at all.
c) They will follow the helical of the clamp. The different helicals are designed to cooperate with the natural twist of the feather.
Answered on 4/12/2011 by Justin from 3Rivers Archery