Led tip Hermione Granger's Wand
thingiverse
I've had to resize it to fit the 5mm LED and the 2xLR44 batteries. It's about 20mm wide at the base and 280mm long. Within the inner tube, you can fit a 200-270Ohms resistance soldered on one pin of the LED. I have to redesign the battery compartment because I can't extract them once fitted. But it works like a charm. The temporary push button is a cube about 9mm (except the moving part and the electrical pins). Thanx to https://www.thingiverse.com/gpass for the original design.
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