Not in hardware stores. Thanks, Future Motion.
Support a Onewheel company: https://www.badgerwheel.com/shop-online/pint-toolkit
Amazon Prime: https://www.amazon.com/Protorq-5-Point-Tamper-Proof-Security-Pieces/dp/B07TN64T87/
You just want the TS20
This is what I bought. I used it for when I swapped out my battery for the quart.
https://www.amazon.com/dp/B07TN64T87/ref=cm_sw_r_cp_api_i_LJ5IFb90GP7NF
Soooooo much easier... if you have the right bit. You need a 5 point torx security bit. like this
Torx Plus IPR amazon