Screw for HC-X1 mic clamp

I've lost one of the screws from the mic clamp - it must have come loose and fallen out. After some time with Panasonic UK, they advised me to buy replacements from their online spares shop (at over £6!!!) but they are out of stock. Iasked them for the size/spec of the screw but they can't readily help me. Can anyone advise? I have attached a photo of the clamp and one remaining screw.20180808_113644.jpg
 
Just as an update, thanks to the advice from Mike I bought two M4 screws from a hardware shop, total cost 10p, a large saving over the £6 Panansonic wanted!
 
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