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I use something similar to Chris, except my angle iron is laid flat to the bearer so the pulley sits on the edge of the angle. It works a treat. The angle is 4mm thick and the pulley is 5mm in the center. A bit of grease on the angle and its a smooth as butter. If any spots are tight a quick brush with an angle grinder or even just a rub with some sandpaper soon frees up any tight spots.
The only disadvantage to this is some form of hold down has to be used to secure the roof.
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