I have never used the device. The frame buckled/changed shape as I tightened the brake wheel on the rear tire. According to the instructions, you have to turn the yellow knob (which presses the brake wheel against the rear wheel) until it clicks. Well, it never "clicked"! As I turned the knob and waited for a click, I suspected something was wrong. When I removed the grip and resistance assembly, I found that the frame and L-bar (which attaches the block to the tire) had bent/deformed! I didn't feel like I was over tightening the knot as it was fairly easy to twist (with one hand). It just didn't "click" and the frame (which is supposed to hold the bike securely while I'm pedaling like I'm climbing a mountain) flexed with little effort. I'm sorry, but that seems dangerous to me!
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