Simple Things: Idler Spring for Hinged Extruders

I think at this point, most people use their hinged extruders without springs. Improved consistency in the filament diameter from reputable vendors has made this possible. Still, I wonder if there is anything to be gained from having springs. The only choice around here is a variety pack at the hardware store, and only 4 out of 50 springs are even remotely suitable for use on the hinge, so here is one alternative.