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If i have more than 1 turn of rope it's going to get tangled up trying to rotate 10 times to open/close the curtains. Since the rope will move sideways until it hits the end and bunchs up. I could have a multi turn spiral type pulley but then it needs to be large enough to handle fully opening...

Nope, it's very low duty cycle, it's only to pull a curtain open/closed.

Hi, new member, I'm looking for a type of pulley that can grip a 3mm nylon rope with only 1/2 a turn. The best way i can see this working is to have little movable bits at 90deg to the rope all around the pulley. These bits would rotate in/out around a center pin. As the pulley rotates it would...