I had recently got a sweet deal on a compact uniweld regulator. My thought was to "convert" the input from CGA 320 to 1/8" to run a paintball tank through the ASA. I had these materials so I decided to try that instead of ordering a CGA 320 to PB tank adapter.
What I did was, using a bench vise and a pipe wrench, broke the 1/4" brass nipple off about 3 threads INSIDE the regulator body. OK I thought...I'll use a "bolt-out" bit and get it out of there. I got the bolt-out bit seated real good, but upon trying to extract the nipple, the bolt-out bit broke! My goodness! That's tempered carbon steel. My thoughts were there must be some kind of sealant, lock-tite or something in there. No way would the mere tightening alone of that nipple create a strong enough bond to break that bolt-out bit.