H, I am reassembling a Cen NT-16 Rotary Carb and just cant seem to understand how the thottle stop screw works, and keeps the carb open at a certain position when it idles. I have it screwed in, but it makes no sense that when you tighten it the hole opens and lose it the hole closes (or the other way round). All I can see happening is the screw fitting into the groove...

Hope someone can help

Josh