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Welcome to astronomy and telescope making, or restoration and modification at least, it's good fun and rewarding. Nice job on the base though i'm not too sure on the diameter of the altitude bearings, conventional wisdom via ATM books is that the bearing diameter should be similar to the mirror diameter for smoothness and stability. The dob mounts that I've made have worked well with that criteria in mind.
Actually the original mount that you show is very similar in appearence to the mount that my first 6" dob came with many years ago, though mine was of metal plate and pipe construction. Like you , I built an more conventional plywood mount that works very well, much better than commercial dob mounts. Not too sure on the Cadbury purple tube, but hey, it's a one of a kind and it's yours and you don't have to please anyone but yourself, vive' la difference. and you now have a solid functional telescope that should last for years.
Congrats and well done.
Kind Regards
Jeff
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