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Hi Alex
As you know I have a good workshop and can make just about anything
I am going to attach an articlle I wrote years ago when I made an azimuth "bearing" out of a rocker box. It won't directly suit what you want but may give some ideas. I fitted encoders to it (the same ones I now have fitted to my lightbridge that uses them with the Argo Navis.
Look at the centre bolt design. I turned it up on the lathe out of scrap.
Barry
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