Screw Size for Limit Switch

I bought a set of roller limit switches from the shop but the smallest screw I have, 4-40, is just slightly too wide for the mounting holes on the switch. Any recommendations on the right size screw to use?

It looks like I could use a 7/32" bit to open the hole a bit, there is some extra plastic, but I’d rather use the correct screw if I can get them.



I believe they are M2.5, I just use the small zip ties though.

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Great thanks.