Well, https://www.practicalmachinist.com/v...-lathe-344580/ may be helpful here!
Good use for an old optical bench, I use optical bread-board off-cuts to make bases and work surfaces for some of my small machines too. Olderdan's method is similar to Jurid's abrasive coated brake pads we sold in the 80's for cleaning up disc faces and removing the surface layer, these days with most pads being significantly harder with lots more embedded metallic elements the discs wear much faster, so such tricks are no longer required, changing discs every 2-3 sets of pads being the norm now.
Engineering is about what works and this works.
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