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highly recommend if you haven't already that you have a look at Reiner Vogel's website notes re EQ platforms. I built a vertical south segments (i'm in new zealand. Norther hemisphere would be vertical north segments) platform. ) platform using the design concept. For drive I use a packaged celestron basic drive (for their very basic non tracking GEM mounts) costing about $50 on ali express. For rollers I use 8mm hard steel shaft and bearing blocks also from aliexpress. Total parts cost is under $100.
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