I finished my polisher yesterday, and just tried it out. I'm surprised how easy it is to get a good result - just a couple of minutes. I thought it was going to be more difficult - a nice surprise as most things in watchmaking are harder than you expect.
I bought self adhesive 3M lapping film https://www.cousinsuk.com/product/film-lapping-3m-261x266x , 9, 3 and 1 micron, and stuck it to sheets of glass. The 9 micron is course enough to remove large scratches.
I'm glad I used the M6 thumb screws as the large heads allow for small adjustments.
I used green blotting paper under thick glass and a few tiny pin nails on the sides of the glass to stop it from moving. I also had wood beading all around my bench to stop things rolling off.
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