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Hi Paul
Sounds good so far. My ROR Obsvy. is 'still' in the planning stage. From the research I've done over the last several years it sounds like you're on the right track. Your idea for the cage inside the concrete plinth is sound based on what I've read. The advice I got from Steve (he of the SVAC spit!) was to go for three bolts for mounting the pier - for the same reasons you give. I actually have six holes drilled into the base of my pier - if you like I can post a picture. The holes are 25 mm in diameter. The top of the pier has no rat cage - instead it has three steel blocks that have been cut and drilled to take the top of a HEQ5 Pro tripod head.
Hope that this all helps - but keep in mind that although I have the pier made (and it's sitting in the garage), it doe not yet have a proper home!
Paul
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