Lucky, lucky.... I might have to try a few of my others now....hehhe... I was able to get my adapter 901-510 working but only after I sanded down my threads on the AFS brass part. O and by the way, I was not happy with the juice flow on the 510 without modification. It needs a bigger hole for juice to feed properly.
Did you make some more channels around the lips of the adapter Keith? This way 510 will be feeded properly without modification. I dont have those adapters to check it.