http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3630035987&category=42319
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I don’t know if it was this brand or not, but an acquiantance of my brother was using a similar thing. The device broke, causing him to slip off the back of the saddle and get his “vitals” caught between the brake calipers and the tire. He is now singing soprano and crapping into a bag. Ouch!