Pulleys
- Price:$6-50
- Pros: Comes in a variety of sizes. Simple structure.
- Cons: Can be expensive. Does not including a mounting structure
Double Wheel Pulley
- Price: $35 for a 10 pack
- Pros: It's the smallest one I've seen so far that ships from the US and isn't prohibitively expensive.
- Cons: It's metal, and the weight is not listed so it may be heavier than we'd want.
- Price: $2.75 for a 50 pack
- Pros: Very cheap. Lightweight
- Cons: Would require modification such as the addition of an axle in order to serve as a pulley
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