Instruct: Classify a given Amazon review as either positive or negative.
Query: Can't use it

As someone else mentioned, this product won't stay on the doorknob. I need to come up with something to keep it from falling off. Once I get that fixed I know I'll use it, but I haven't had the time to futz around with it yet. I was excited to see this rope exerciser as I used one in the late 70s, early 80s, and it worked wonders. If they'd just make it so that the darn thing will stay attached to the doorknob! Who designed this thing? The one I had back in the day was cheap and not the greatest quality, but at least you could attach it to any doorknob and it would stay.