Anybody got a link to some good fletching instructions? I have a dozen shafts to fletch with QuickSpins on a Grayling fletcher. Any tips? I don't know how offsets and helical works, to be honest. I have never requested helical, and I assumed all fletching was 120*. Where is the offset measured from. Can the Grayling be used to make them offset? Do I need it with the Quickspins? Any advice would be helpful.