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David;
I agree with Danny...the overnut seals onto the upper flat surface on the (brass) Temp Sensing Bulb, and pushes (and seals its lower conical seat into a matching conical seat in the head...these should be clean for good sealing)...trick is to seal the overnut to head threads, but NOT to unite the TSB with the overnut by gooping between the two with sealer...when the sealer is baked on and the two are united, it will cause the capillary tube to twist when loosening it next time...very undesirable! I even put just a little graphite grease between the TSB and overnut to prevent locking the two together...
Good Hunting!
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