417 safety selector

[Chek]

I recently bought a VFC HK417 which had a loose screw holding the safety selector in place... I don't have a hex/allen key that small so I managed to  unscrewed it with some long nose pliers before it fell out itself but now I don't know what size key to use to screw it back in (after spraying the gun), or where to find one that small. 

The smallest hex key I own is about the same thickness as the screw.

Anyone encountered something similar and can advise?

Many thanks 

 

[RostokMcSpoons]

I'll take a look at mine later, try to get a size for you

 

[Lozart]

Once you get a new screw: https://www.amazon.co.uk/dp/B0854KM5PB?psc=1&ref=ppx_yo2ov_dt_b_product_details

 

[RostokMcSpoons]

Apologies for taking so long to get back to you.
I've tried all my small hex keys, both imperial (1/16" and 0.05") and metric (1.5mm and 1.27mm), and none of them seem to fit!  I might just be being very ham-fisted but peering into the holes on the selector levers on each side, there's very little for the things to bite into.

Lozart's set of hex drivers would be good - I have one small hex driver and it's always feels easier to use than the Allen keys, so useful regardless of whether it solves this specific problem it's a good purchase