Well, unknowingly I had been following Tom's advice and had two brass rings under the outer brass nut. I reinstalled and filled last night and no leakage-so far. Let's hope that holds. Thanks all.
I use a little grease also. I don't like using any sealant if I don't have to. It just makes it hard on the next guy (probably me!) to get it apart and cleaned up next time That is what the gasket is for.