Dollar fifty ain't worth two paragraphs about a blackout, honestly.

The torque feel on brass gears is such a liar, the metal gives no warning before it lets go. I ruined an Exakta shutter curtain once because I thought I could adjust the tension by feel, and the whole thing just ripped sideways. Now I keep a cheap torque screwdriver on the bench for anything with brass, and I still second guess myself every time before I turn. That sinking moment where you realize the snap was not a spring reseating but something breaking, yeah, it happens to all of us who work on this stuff too long.