What's the size of the screws used to for the headphones?

[Druan]

I want to use some o-rings in order to tighten the headphones on my Index as they have a tendency to move around when playing stuff like beatsaber but I don't have any screwdriver heads small enough to do the job. What size do I need?

Edit: found it. it's a torx t6 (https://www.valvesoftware.com/en/index/deep-dive/extensibility)

[Zen the Fen]

The link you gave is useless. Steam is blocking it