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Richard,
The sketch shows a cross-section of the dome's running gear. I fixed rolled sections of C-channel to the underside of the dome ring, and then attached 13 brackets (coloured purple in the sketch) such that they sat inside but cleared the C-channel. Therefore the dome can lift only about 6 mm before it's stopped. I'm not aware that it has ever lifted, even during 100 kph wind gusts.
It would have been far simpler to not use the C-channel and make brackets that came over the top of the dome ring, however that design would have been dangerous in terms of getting fingers caught.
When closed, the shutter is clipped at the top, clamped at the bottom, and also roped at the top - just to be sure.
Cheers, Chris
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