Grant85
Head Pro
It is the golf authorities that need to police their rules, self regulation is and always will be open to urine extraction.
I think all of these ultra thin faces are on the limit, I would not be surprised if some are out side of legal due to tolerance. I also bet there is a tolerance as well that makes the hot ones legal and they are cherry picked. But you have to be swinging 115mph plus to really see it and I bet you could if your a tour pro feel it.
I'm sure this is the case. In reality golf is probably the only sport where people are getting away with breaking the rules, whether innocently or maliciously, every time the tee it up. There seems to be very little testing going on and manufacturers who will happily take things beyond the limit.