I had my Krytonite mini for a few years now, and I remember installing the Flex-frame bracket on a bike frame which I left outside when I got it. I had a go at removing it recently and put it on my Mint MTB frame and now I'm very unsatisfied with how it slides from side to side when standing and generally backwards.
It seems the rubber running inside the strap has perished and no longer keeps any kind of grip. Would I be able to go to a hardware store and get a piece of rubber that will really keep it in the same place? Do these things actually work with performance oriented riding?