Shifter threads

The way the threads are now- 3/8"NF die will chase extremely loose, too loose to 'bite' and tighten, will spin free. A 5/16" die will not start- the shaft diameter is too large. Metric doesn't seem to work either, thats why I refer to it as 'mystery' threads. The bolt in the photo is 3/8"NF.100_2338.JPG100_2340.JPG