Núm vặn kẹp M10 (Female clamp knob)

I made this to replace the missing knob on a super cocoon chair bed, but this can be easily used on other furniture or simply as a better clamping knob for projects where you need to quickly loosen and tighten the assembly 

To make this you will need:

1x M10 nut

1x M10 washer - Ø29.5mm OD - 2.5mm thick