What's the thread size of the choke rod? I think someone crossthreaded the internal threads on the lower choke rod and I can't turn the upper rod down far enough for a proper adjustment, even with a new rod. If I can rethread inside the lower rod, I won't resort to sawing 1/4" off the upper rod. The lower rod isn't obstructed, so I conclude the threads are the problem. -ron 65,66