I'm looking for where to buy the ropes and wheels, can you help me?

Nice.

What's the point of being able to open both sides of a sash window then? We have a couple but I could never figure that out

Can you show it being made?

The very nice old system of a sash window.

very fast but you don't explain anything. maybe in the future tell people to turn the electric of first and say which colour wires are which