I'm finally putting my rack of VB44a carbs back together after the soak and rebuild but have found a problem. While following the MacGregor guide I realized I lost the screw for the choke idler. I can't seem to find anywhere what kind of screw it is. If anyone could let me know what screw I could pick up at a hardware store, or if you have a spare in your possession, please let me know! Thanks all.

I pulled that photo from the guide, unfortunately it's very small.