Hi leon.
You can use one of the blanks for the grinding tool. I was considering using the 3/4" thick one for this.
I believe the 8" glass could also be used for the 10" blanks tool as the tool can be smaller than the blank. Cant remember the size difference tolerance though. (I think this is mainly for larger mirror grinding. To reduce cost and physical strain on yourself).
You can however make your own grinding tools out of glass/ceramic tiles and dental cement or something similar.
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