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Richard, I used powder coated aluminium for both my alt and azimuth bearing surfaces, works brilliantly.
My azimuth bearing is a 600x600x3mm aluminium plate powder coated in Aztec Gold and glued to the base of the rocker box. Alt bearings are cast aluminium but powder coated strips glued to the current bearings works too.
Allow the powder coat to harden for a week before fitting it out.
Teflon pads glide on it ever so nicely. Due to the weight of my scope I fitted a teflon pad around the centre pivot and shimmed it up 0.6mm.
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