A board member was having trouble maintaining the working pressure on their MA957 Regulator. This was the response from Milwaukee's Technical support:
Trouble Shooting MA957 Regulator
The procedure is as follows:
If you have a pH controller, unplug the solenoid from the controller and Plug your solenoid into a wall socket or power strip. Do not have it plugged into any type of controller or timer to do this adjustment.
Turn your CO2 bottle off. Go to the regulator and turn the main knob counterclockwise till you feel no pressure. Next go to the needle valve that is underneath the bubble counter and turn it counterclockwise all the way out.
Now go back to your CO2 tank and turn the tank to full open. At this point, even with the tank full open you should have no bubbles coming through the bubble counter.
Very slowly, turn the big knob on your regulator in until you start seeing some bubbles come out of your regulator bubble counter. Do not pay any attention to the right side gauge. All we are interested in is the bubble counter.
You must proceed very slowly when trying to adjust the CO2 regulator. Go slow, slow, slow; take your time, we want to slowly work the bubble count up.
Turn the knob one eight to one quarter turn and wait about 30 to 45 seconds or longer before making any further adjustments. Continue with this process until you get a bubble count that is equal to or a little greater than what you're looking for. At a bubble count of 60 bubbles per minute, you might want to take it up to 80 bubbles per minute and then use the needle valve to crank it back down
The right side gauge is not relevant to adjusting your gas flow. Indeed, we have been trying for several months to get them to take the right side gauge off of the regulator because the bubble counter is your true an accurate gauge. Therefore, any reference to the right side gauge serves no purpose.
This procedure, when followed, works about 90% of the time in getting regulators consistent in their flow. The primary problem for poor flow consistency is that too much gas is backed up behind the needle valve causing the diaphragm in the regulator not to function properly.
If you're using a pH controller plug your solenoid back into the pH controller box at this time.
Thanks for the info fraynes1!