Knob for M10 nut

I made 6 of these knobs to suit the bolts in a set of woodworking sash clamps that I made a few years ago. Before I made the knobs I would tighten the bolts with a large spanner, which was slow and cumbersome, and drying glue will wait for no-one.

There are a few knobs in thing-verse, some are quite nice in design, but they are all too complex for my application, and they all tightened the nut over the 3D printed plastic, which is not ideal.

This one fits snugly over a 10 mm nut and has a