I used to have in my screwdriver collection a flat screwdriver where the flat was split up quite a ways up, and there was a sliding collar that when pushed down spread that split tip, and it gripped the screw. I hope that made sense. It has been a long time since I have seen it and can't find it. Never saw one before or since. I don't know where it came from or where it went, but it sure would be handy right now. Is this a common thing? I am working on tuning a carb and changing air bleeds. The primarys bleeds are tough in front of the choke. I have been putting blue tape on the screw driver tip until the jet sticks in the slot, but that is a pain in the ass, and it scares me working on top inside of the carb. I can just see a jet down in the manifold! I don't know what it is called or I would google it. Any one know where to get one?