Ender 5 S1 - Tell me where this set screw came from

I have had my printer a month and just noticed this set screw on the table next to the printer. Can anyone tell me where it goes?

Hi, @BruceG Top screws, approximate location may be: upper side of the extruder’s heating module or gears

Thanks, Collin. I will check that out.

It was the grub screw that holds the hotend into the heatsink.