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I wanted to expand on the scrapyard building materials for a lapping plate: Treadmills, they get used very little and end up at the dump or scrapyard, the better ones have variable speed clutch and...

EGGZACTLY!!!! Heck, even the harbor freight abrasives, for their quality(lower) are no deal either.

So, that leaves us with SIC, not a bad deal if you make or get yourself a lapping wheel, OR,...

That chef's plate is quite a deal, I am going to get one and have several diamond hones now.

Over the years I have watched sandpaper go UP^ in price and Diamond plates/hones go Down~
So much so...