You can look up Go Customs on facebook, Goran Kobas is the guy who made it.The shaft size is 12.7mm i forgot to post that. I like the shaft a lot,its smoother than any wood shaft i ever shot with. I'm not a fan of the tip i had put on, its a little to soft for my liking. It fits a Bob Frey and Schon i know for sure but don't know about a Starky. On the facebook page he even has some vid's of his shafts. Hope this helps.