Trev,
I've attached some images here to hopefully give you some ideas of the system I have. Basically its a skillion roof structure bolted to brass rollers that sit within a 55mmx55mm steel angle tracks supported by a 100x100mm cypress post horizontally on the wall frame and posts. It tracks along well by rope and pulley and has adequate sideways tolerance to allow for the temperature changes throughout the seasons. It's old school but that's fine for me.
Cheers.
Anthony
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