keithatrochdale

Why not fix the chain to the top roof directly between the two red marks. Then the pulley would drive the roof open by engaging in the chain. The pulley could be sprung loaded to push up against the chain. Now you could have the pulley on a torson bar to the other side of the shed where another chain and pulley are, like a sort of 'parallel motion', you now you have both sides driven. A release of some sorts could be arranged to lower the pulleys to disconnect from the chain and allow manual closure/opening.

Could always do what we used to do, warm some grease in an old biscuit tin until it melts then immerse the chain in it. We then just used to hang the chain from the garage roof to drip, with the tin underneath to catch the grease. Repeat as/when necessary.

Don't forget there is a light that turns on when you use the opener, maybe change it to a red LED? Hope you are feeling better.