So I have an ODB-3 that I bought from a guitar-playing buddy of mine for $20, which is a really good deal. It worked well for a while, then I realized it made a really annoying popping noise when I clicked it down if it was placed in front of my TU-2 in my chain. So I switched the order, and it worked great for a while. After a few more months of use, the pedal just stopped engaging all together. I've tried using a stronger o-ring, using different power supplies, cables, basses, amps, and I still get nothing. I know for a while my input jack came loose and I had to put the washer and nut back on it, but otherwise I can't figure out anything and I'm not a good electrician. Any way to fix it? Any troubleshooting advice?