Drawer Knob - For Fabric Cube Storage

Simple knob that fits over the metal ring on most fabric storage cubes/drawers. Just place the knob through the metal ring, put the washer in the back (either orientation is good, whichever works better) and screw them together from the back with an M4 bolt.
No supports needed.

Requirements:
M4 bolt between 6-20mm long
Fabric storage drawer with metal pull-ring