250F Carb screw?

Ok so I can’t find info on this anywhere. Does anyone know what size the screw is for the slide. The one under the cap(Phillips). I stripped it and wanted to know if I can go to the hardware store and pick one up or if this is a specialty?
 
Ok so I can’t find info on this anywhere. Does anyone know what size the screw is for the slide. The one under the cap(Phillips). I stripped it and wanted to know if I can go to the hardware store and pick one up or if this is a specialty?

4mm by about 4-6mm long.

This holds the slide onto the rocker.
 
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