I love my ThermoQuads, but one of them has a problem

One of my TQs keeps leaking and dumping fuel into the engine. I'm not a real TQ repair hotshot myself, so I had a known good carb mechanic glue it back together, and it was running pretty well, but apparently it has failed again so maybe he missed something? (FWIW he's got the TQ's on my other LA and my RB engines running perfectly.) Any tips on what to look for when we take it apart this time, or about how to permanently repair it? Thanks a lot, guys.