Snerk.If you put your watch in there for cleaning you'd probably never have to wind it again either.
After a watch is disassembled, all the little parts go into a wire mesh basket that fastens to the bottom of that shaft. It gets dipped in a special solvent, and then in a rinse afterwards. More modern version have it all automated, so the machine automatically moves the parts from the solvent to the rinse.If you put your watch in there for cleaning you'd probably never have to wind it again either.