Jonro - Pull your carb apart and inspect your slide. i have a feeling that it has a bur on it where the idle gap is adjusted. I would be lead to believe thats what happened...

This can happen when you adjust the idle without pulling throttle slightly.. Dremel the bur off or use some scotchbrite. Also when you remove the burr dont be afraid chuck up the slide on a drill and run it some while in the carb body. It helps free it up some and may prevent additional sticking.

Some guys have this problem some dont. It seems hit or miss.

Hope that helped...