Haven't posted here in a long time, but I have a question regarding compressors. The one I have I purchased off of Amazon 2+ years ago with the trio of master Brand airbrushes it came with. Just the diaphragm unit with no tank. I have always been suspect at the accuracy of the regulator, but lately no matter how much I dial 'up' the spraying pressure remains at 20-25psi. I can drop it down, but can't raise it any higher. I have a Badger Patriot 105 which I use primarily all the time, but occasionally the Master AB, too. I've tested it for leaks, but the only sure thing seems to be around the handle mount on the one corner of the cylinder head cover. I've tightened it as much as I dare for fear of breaking the bolt. Should I just replace the unit and figure to do this every couple of years? Can't afford a high quality unit such as a Badger or Iwata and I'm not a prolific-read fast-builder.