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I would just hire a cleaner. No gears to break and easily replaceable.
I've just found the actual supplier https://www.alibaba.com/product-detail/Large-Diameter-Precision-Plastic-Derlin-Acetal_62260603695.html?spm=a2700.galleryofferlist.0.0.37185f32jtXP0hNeed a shipping quote Jo
About one a year, so I will have to live a long time to use them all Jo