ORIGINAL: rybohunter
A UBAR "Universal Broadhead adaptor ring". Basically it's a small washer that bridges the gap between a small diameter carbon shaft and the lock ring used to retain the blades. I had to use these this past season when I went to carbons.
I didn't know that as I just switched to carbons last year but up to 30 yrds shooting with fingers I'm getting a baseball group. I'm going to have to cheque that out. Thanks for the info.
Bobby