Bearings: the Mechanics of Movement

In the back of my mind, I’d had this idea that because the tube walls were so thin (1/4”) it would not be possible to attach trunnions (for altitudinal adjustments) directly to the tube. My first thought was that I should cut two rings that fit along the outside of the tube and be situated exactly where the plywood baffles are. These external rings could be screwed into the internal baffles and thus bear the weight more safely. In my mind’s eye it seemed to me – again more for aesthetic reasons than anything else – that if I had external rings at 18” and 36” up the tube, I should also have rings at each end.

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