Hi @docrex,
I just removed (and added) a screw to one of my JoyCons using both a Y00 and a Y000 bit from our toolkits. The Y000 worked but definitely felt a little off–you’d need to be careful that you don’t accidentally strip your screws if you go that route.
As for the [link|https://www.ifixit.com/Store/Tools/iFixit-Precision-4-mm-Screwdriver-Bit/IF145-373?o=1|4mm Screwdriver Bit Listing], are you talking about the individual bits for sale? You can select any of the Y0, Y00, or Y000.
I hope this answers your questions! Let me know if you have more or if I missed anything.
