Last weekend, I made a little zip-line for the kids. 40' long, very shallow angle—maybe -4 degrees. They could get a running start and go about half way. It was not zippy. But, they were having fun. After about an hour, I noticed that the pulley was not turning. I grabbed another. It was seized, too. Both were seized. Solid. Couldn't budge them.
They were both Mad Rock 3" Rescue Pulleys. Both had bushings and were cheap, $20 each. I never expected much from them, but didn't expect them to seize the first time they were used.
Of course, bushing pulleys are not good for zip-lines, but like I said, no zipping was happening.
Anyone ever seen two pulleys seize on at the same time? Sounds like a bad batch to me. Mad Rock has discontinued them, but offered a refund if I send them back. Awesome!
What's your recommendation for a zip-line pulley?