Ender 3 V3 SE screw found?

I found this screw down in the bed area. Any idea what it might have fallen off to point me in the right direction - before I start looking in all the wrong places?

M3 grub screw, possibly from the hotend? Thinking back I thought there were 2 of these on the back and one on the front, I’ve changed to a Microswiss since so can’t quite remember.

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Which hotend did you upgrade to? I’ve been thinking about changing the stock to something better.

And how is it working for you?