Hi, I have a Dunlop Crybaby Classic Wah and it's always worked fine, and it's been one of my favorite pedals...Recently, it just stopped working...when i click it down to turn it on and rock it back and forth you hear the slightest difference, and if you weren't looking for it, than you wouldn't notice at all. If someone could tell me what is wrong or how to fix it, that'd be great. Thanks!
Problems to check:

Dead Batteries
The little cog thing has come away from the lever shaft thing (wow, technical )
Broken Pot
Dead Batteries
haha, check your battery a third time as well
Suhr Custom, Flaxwood Rautia or Grosh Tele thru
HBE Medicine Bawl Wah
Analogman BiComp
Texas Two Step OD
Fulltone Ultimate Octave/Fuzz
Boss CE-2
TC Nova Delay
SLO-100, 65 London or Bogner Shiva
Ask me about any of this stuff!
You might want to check the battery (that is such an original idea) or mabey its somthing more serious i love my dunlop crybaby too.
I know now what I knew then, but I didn't know then what I know now
ah, but have you tried a different/new battery?
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Could be the switch as well. I have a Crybaby classic and had to put in a new switch when mine broke.