Thanks for the link.
But i am using hte CX Hs and all that now because i no longer trust stuffed arrows.
Once had a dozen ST ePICS and stuffed em with well fitting poly rope, after half a year of practice (mostly stumpin for me) some started flying odd, i opened the worst in length and the rope had pushed itself against the nock.
Also tried to glue a piece of tube / rope behind the insert, shook loose after 30 shots, had to throw the shaft away, its stuck in the middle.
I think the impact pushes itonly forward for an instance and then the power bounces back, or it is while the arrow gets launched however, neither worked for me so i wont stuff any shaft again.
Thanks nevertheless