well... i opened my pack of 100 grain thunderheads today and out falls this little red paper that says i need to use ubars for my carbon arrows.What exactly is the purpose of the ubars?What will hapen if i dont use them?
I bought a box of the Thunderhead 100s for Carbons and they came with the UBARS. Same broadhead but they just come with UBARS. As for me personally...I think the UBARS aren't worth worrying over. I screwed them into two diff carbon shafts that I have, Easton ACC 3-60s and Carbon Impact Fat Shafts and the UBAR still didn't really help do anything...other than get in the way.
I've not used them as of yet but Easton makes adapters for broadheads just for their shafts...so that might make a better difference for letting the ferrule of the broadheads align with the arrow insert.
I know the Thunderheads are a good head but there was just a little too much extra time involved in tuning with that rubber O ring. I made a move to Rocky Mountain broadheads and am REALLY liking their Snyper & Advantage heads. They align perfectly with my shafts without any adapters.
The purpose of the UBAR is to allow the O-Ring to seat properly on the smaller diameter carbon shaft. Without it, the O-ring has a tendancy to hang over one edge of the insert and cause the head to not sit correctly (wobble). The UBAR just gives a larger shoulder for the ring to sit on.
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