Phone arm replacement knob

If you're a good husband like myself, with at go go gadgety partner, then you dutifully scour Aliexpress each year for stocking stuffers for Xmas.

Finding something that is actually useful (noting stocking stuffers needn't be useful) then gold!

Cept, tricky tricksters design in flaws that see the cheap phone holder (for the bed head) break after a few months.

Mostly it's a stock standard metal thang, but there's a knob that sits over the ball joint for the phone holder that splits under the tension used to hold it in place.

Hence, to further justify my 3D printer to my partner, who keeps asking about cost benefit, I thought I would design a replacement knob to allow the arm to be used again.

I'ts heftier than the orignal, with "knobs" (so a knob with knobs).

Of course, I had to order in thread gauges from Aliexpress to get the correct guage et al.