[SOLVED] Where does this screw belong?

I found this on my build plate after a print. Where does it go?

Length including head 7.0mm
Thread outer diameter 1.9mm
Allen head, diameter 3.45mm

I’m hoping this is a clue regarding a problem I’ve been living with for a while and attempted multiple fixes for.

Gah, nevermind, I found it: On the back side of the nozzle heater assembly.

All four of these screws were loose. The borrom-right one is several mm loose, and the two left ones I tightened half a turn.

Are the four spring washers here intended to be the source of elasticity for the eddy current sensor to work?

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