This regulator came came with my MM252. Just got a refilled C25 bottle and when I turned it on, it did this:

Never saw this before. Quick fixes?

http://youtu.be/amBoK***Dhw

PS. Well geez..... they won't let me post a video here. Unless I don't know what I'm doing.
All I can say is the regulated side gauge needle vibrates full deflection when I start cranking up the pressure. Strange.