Lost headstrap screw while doing a repair, looking for a replacement.

I have lost the screw referenced in step 14 of the head strap replacement guide.

Valve Index Headset Head Strap Replacement - iFixit Repair Guide

Does anyone know what the size/specification of the screw is so I can replace it? d

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I have reached out to valves support simply to find out what kind of screw it is and was told that they are completely unwilling to tell me.

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