I stopped by the local bike shop looking for one of these. First they had never heard of them, and then proceeded to tell me that drilling a couple small holes in the chainstay would dangerously weaken the frame. I asked how they fixed frames when the stop is damaged and apparently they just replace the frame. I was going to attach one of these to a Nashbar Touring frame, which has fairly large diameter chainstays. I need a stop further from the dropouts to support cabling a Nexus hub if I don't want to run the cable housing the whole way with zip ties. Is this dangerous?
