I got tired of periodically buying new pumpsets when the old ones wore out so I tried replacing the silicone tubing on the pumpset (the part that wraps around the wheel and eventually stretches out) with silicone airline tubing. The airline tubing is a little thicker-walled, but it has been working fine for over a week. As a precaution I used a little bit of super glue to hold the tubing in place. Just thought I would share the tip.