I had Williamsons Instruments repair 3 of the "Redball" meters some years ago. They are difficult to do as the working pressure in the bulb is 90-100 lbs as opposed to 9-10 lbs in the normal meters so they are expensive (if they can be repaired). Mine were $250 each repair! I don't know if they are still doing them. I'm out on vacation right now so can't supply you with contact info. Good luck.
