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I am in the process of doing the same thing. I have the dome and have just completed the decking. For the foundation I dug a hole about 650mm sqaure and about 750mm deep. I used a old Oxy/Acet bottle that I gas axed the top off and welded to the top, a mounting plate about 400mm diameter. This is concreted in the ground and rises about 500mm above ground level with the plate being flush with the top of the deck. I am using a Bintel pier thats already machined to suit the LX200 wedge its also marked with the position its to be orinintated (South) I lined it up using a compass and bolted it to the mounting plate (18mm shoulder bolts).Any discrepencies in the level, direction etc can be made on the super wedge (I hope) Anyway this weekend I am erecting the dome, wedge and scope so I will let you know how I get on
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