My mitty vac seems to have a leak down problem. I got it from Harbor Freight (its the metal one) less than a year ago and was wondering if anyone has opened one up or fixed one. I usually pump down to 15 or 20 hg which shouldn't strain its little innards too much?? I almost went through the hassle of pulling an unlock line out which woulda really been fun. Tracing a leak with a leaky mitty vac is not working

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"