Totally get that with tools too. My old drill works perfectly fine but I still catch myself looking at new models. What’s the last thing you almost upgraded for no real reason?

Well, sometimes you also need to know why it didn't work. Just my two cents, @caleb_price.

Totally feel for you on the dust control gear. That fine plaster dust gets EVERYWHERE, even with good plastic sheeting. My cousin hired a guy who didn't seal the room properly, and they were finding gritty residue on dishes weeks later. It's a legit reason to pay for pros who know the tricks.

At Lincoln High, our chem lab used Mohs kits for mineral tests. Kitchen knives can have different steel hardness, so not scratching quartz might not prove much. I saw a cheap knife leave a mark on my cousin's quartz countertop. The scale works best with standard tools, not random objects. Home tests can be misleading if you don't know the knife's hardness. That's why I see the knife test as incomplete.

That's such a good feeling when stuff gets fixed instead of tossed.