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Thanks guys. I think I have a solution here. I add another 90 x 45 pine beam to widen the top part of the wall frame that already has a 90 x 45 giving a total of 90mm wide timber at the top of the wall.
Then add those sliding gate tracks in. Snap a chalk line first to make sure the rails are straight and make a spacer to make sure the 2 walls tracks are the same distance apart.
Then screw those sliding gate wheels to the underside of my rolloff roof.
Test it out and adjust as needed.
I would add a few straps that can be fixed easily so the roof doesn't lift off in heavy wind (in my case its a sheltered spot so not too concerned).
Greg.
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