My last one lasted a month, I took it off and cut it up, not only was it so stiff it kept the hand brake on, it was 1/16" thick one side a 3/16" the other. So I spent about £6 on a "universal" gear lever boot off e-bay and made it fit. I left 1" of the stiff handbrake boot and glued the new one on to it. Couple of tie wraps too. A year on and still working great, no leaks, and still very flexible.