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Thanks for the comments guys.
Andrew, altitude bearings are 150mm PVC pipe endcaps. BTW, I like your motorised dob, really nice.
Twokids, the tube is held in by friction. The box dimensions provide for a tight fit with the tube. You cannot slide the tube into the box, you have to assemble the box around the tube. In this case the box separates into 2 halves that are held together with screws.
Cheers,
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