I have one from some years back, and the design looks the same currently...
Them two wires (to give tension and work as a spring) always come out, along with the little posts that go in the holes...
And yep... One side sounds considerably deeper than the other...
Mine is a clunky call, that tends to make noise while walking, and if it is not making noise while I am walking, it has come apart...
If you or anyone else has come up with solutions to the above problems, I would love to hear them... I bought it as a last-ditch-effort call for those birds that are henned up, and have yet to have success with the call (even on the few times it has stayed together long enough to work).