Filament Spool clamp (Malyan and others)

This is an alternative method to lock your spool in place. I was getting fed up of tediously winding 2 nuts on and off the bolt everytime I changed the reel.
To use, just pinch the handle, slide along bolt so it buts up against the bearing, then release. It maybe a little stiff at first. I haven't tested it excessively so unsure how long it will last before fatiguing.