REI put it on for free when I explained the problem and showed how others were having it. I think when they investigate it, they have this as a standard solution, because there is another guy I notice through the internet who talked to REI a few times about the problem who was sent an identical sheath and instructions. (I get the sense he didn't live close to an REI store, and didn't ever bring in his bike,so they mailed it to him). The tech at my local REI told me it also happens on some Cannondales with the a similar set up, but the week before he was completely unfamiliar with the problem.