Tom, I am using a milwaukee set up (when It breaks I'll take your advice) and I was wondering about the plastic washer. I just tripped over a rex grigg post that insists the washers are one use nad must be pried out and changed every time a tank is refilled.. have you found this to be true?

my second tank did not last very long -- I assumed I didnt' tighten enough. The third tank is going okay, but its just been a couple of weeks. Have I made a mistake by NOT changing the plastic washer. ?