My Nuarc frame was uneven and the rubber gasket would not seal. When I pressed down on the glass frame and found out what side was low, I actually used masking tape as quasi shim material under the gasket edge that screws down to get the glass to sit level under the and allow the frame to make a seal. Works like a champ. I went to an auto supply store to get hose and a bleeder valve to put in the supply line that I can use to take off the vacuum and open the frame.
Originally Posted by juan