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Just wait till you get dust in them.
My old 12" had a homemade altazimuth fork which used a 20 cm diameter stainless roller thrust bearing, with rollers about 5mm diameter sandwiched between 2 thin steel rings - the whole bearing being 8mm thick. Dust was a major problem and the best way to keep it out was to put a thick felt ring, with neat fit around the bearing. This also provided adequate friction drag too.
Don't be tempted to add any lubricants.
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