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Thanks guys. I will look at each of your suggestions in turn over the next week and ring a couple of the places suggested to see if they can help me with a simple solution.
I intend to place a pneumatic tyre up against the dome ring on the inside to drive it. I may even put a bearing'd roller on the outside, in the narrow gap between the building wall and the dome skirt, just to give it something to push against.
Not sure about overkill being, "huge" with a car winch. I found plenty online that are rated to only one or two tonne. Nothing wrong with a bit of over-engineering, especially when it's only a couple of hundred bucks.
Loving the suggestions though! Thanks to you guys, I now have a few decent avenues to check out.
Bless ya's!
Baz.
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