My volume wheel just broke as well, looked the same as what
@Pedro.Tx posted a while back. I ended up using the end of the 1.5mm bit (measured 1.7 across the flats) from my mini-screwdriver set (
https://www.amazon.com/gp/product/B01AL7600A). It pained me to take the bit, but for $14 it's a lot cheaper than buying the parts from Tesla.
Steps I took after disassembling the assembly with the wheel in it:
1. Drilled out the broken hex with a 3/32" bit. I went deeper than necessary to give excess epoxy a place to go.
View attachment 706637
2. Cut the end off the bit where it starts to taper down to the 1.5mm end
View attachment 706635
3. Coated the inside of the scroll wheel with epoxy and inserted the bit.
4. After the epoxy started to gel up (I used a 30 minute work life epoxy) I carefully aligned it to make sure it was perpendicular to the face of the wheel.
5. Cured overnight and reassembled.
View attachment 706636