I used to roll my eyes at people who covered their cams, figured it was just paranoia for folks watching too many spy movies. Then my buddy who does IT for a hospital showed me how easy it is for malware to flip the light off and run the cam anyway, and I switched sides real quick. The sliding covers are worth the 8 bucks, mine clicks open with a thumb and no gunk on the glass. Your post-it residue problem is exactly why I gave up on tape and paper after like a week. Weird part is I still forget to close it half the time, so now the joke is I paid money to be lazy more neatly.

Disagree, fit matters more than matching every bullet.

That rusty wheel finding is solid proof that tools don't care about looks, they just need to bite. I've pulled old blades and bits out of my grandpa's garage that looked rough but cut better than anything new from the store. Half the battle with rusted parts is just having something sharp enough to get started, so finding that wheel was pure luck on your side.