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It's set up the same way a sectional door opener works - but I use the observatory walls instead of the supplied aluminium beam to keep the fixed spacing between the pully wheel at one end and the motor at the other end.
The portion that runs past the motor is a chain, and the remainder is a steel cable (so it can roll around the pully)
Both ends are attached to the roof.
I think the key to success is to make sure your roof is as light as possible and really smooth running.
James
Edit:
I should also say the cable/chain connections to the roof are able to be removed easily just in case I need to shut the roof manually.
Last edited by Moon; 04-10-2011 at 02:21 PM.
Reason: Additional info
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