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Do you have the Sirius installation manual? This would help a lot.
Two points I can think of:-
1. The flatness of the slab you are bolting the observatory to is very important. If not very flat you will need to pack underneath the wall segments until the top track is flat and level. If you think about it, bolting the segments down to a non-flat surface will inevitably lead to distortion of the track ring.
2. The Sirius instructions state the whole track and retaining ring must be smeared with grease.
Ian
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