Extruder Holdback

This is a simple thing to solve a simple problem. Trying to feed new filament through my bowden extruder while holding the spring back required three hands, one of which I'm lacking. This simple device can be used to hold the spring compressed and feed the filament. It may or may not be the right size for your extruder but a simple resizing (along the width axis) will make it work for you. Tolerances can be quite precise so it might take some experimenting.