I was fortunate to see it's use demonstrated before I bought my first Kistler...or I probably would have done the same thing

. I've had several guests try to hook through the keeper, and a friend who basically ruined his hook keeper before I showed him how to use it.
I can see how a twisted hook could scratch the blank if inserted a certain way. The only rod I have problems on is a crankbait rod where the little excalibur hooks on the Bandit have scratched some of the epoxy, and actually exposed and pulled the first few threads. I think it was actually the barb grabbing when I pulled the bait off the keeper. I added a little more epoxy to cover it up.