I use the shrewd precision on all my bows, generaly. For my 12", I use a carbon xring with the sand removed, with a doinker on the end. It works great, and the doinkers don't wear out at the rate of the Simms. I like the Simms mushroom ends also, and I understand that Shrewd is doing something different this year, but I like the doinker type stuff best. I have the real doinker stuff for my Olympic type recurve also.

http://www.shrewd-one.com/stab.html

They haven't updated their site in a year, and were promising new stuff on it last year, so if you want to get new details, email them. They travel a lot for shows and shoots, so don't worry if you don't hear from them imediately.