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I think your better off lapping them individually with the sic on a granite floor tile. Glass works well but I breaks. Once you have them finish lapped you can rub them together. Imo 600 grit is...

Fast check and I see the atoma 400 plate complete for 62 bucks on amazon. I didn't find the sticker but my guess is it could be had for less. Good luck searching!

PHIG is a nickname for a chinese river hone. (Peoples hone of indeterminate Grit) and SIC is silicon carbide powder. For lapping it is used on a flat hard base like a granite tile to flatten a stone...

Atoma sells a replacement "sticker" in various grits for around $50 +/- that you can stick on the back of your dmt. I never done it but I know some guys who have. $40 vs $50 for an atoma is a no...

CKTG has some inexpensive plates the last time i checked. They arent made to the tolerances of dmts but for grunt work theyre pretty good. I would still not use them or any diamond plate for heavy...

Sic works great. Just do it over a bucket. It can collect in your sink trap. Ask me how I know.