Parametric knob for attaching camera to $14 Steadicam

Johnny Chung Lee published a great design for a $14 Steadicam (http://littlegreatideas.com/stabilizer/diy/). However, the camera attachment relies on a wing nut and a washer, so when the camera is not attached, the washer is loose, and you have to flip the wing nut to hold it in place.

I figured I could make a plastic knob that fits around a nut, and fills the role of both the wing nut and the washer, thus keeping things simpler.

I decided to try out OpenSCAD to do this, and it turned out