theres a ton you can do. Raise the driver, raise the bridge, try lowering the bridge. Turn the VBC all the way up, set the AGC all the way up if possible, turn the MBC up too. Fernandes says usually it's set to zero, but it will give the Harmonic mode more power. Set to zero, the normal sustain mode has all the power, and the harmonic mode has "none" from the MBC pot. Turning it half up, or all the way up, will give the harmonic mode more power. Experiment with where you are happy with the balance and then you'll be happy. Before I played with the MBC my sustainer was enormously powerful on the normal mode, but the harmonic mode was kind of weak. I turned the MBC up and it was balanced between the harmonic AND the normal mode, now I can sustain on all the strings on the harmonic mode with full strength.
But if you broke part of the pots- this is pretty useless. Also, if you use 9 gauge strings, it'll be harder for the sustainer to sustain on the higher strings. Switch to tens if nothing else works. And of course put in a new battery.
The sustainer is still working, and i've already figured out the part needed for this. Maybe someone with more experience can help me with this one. As you can see on the pic it is installed on my RG2550z (it is installed by a professional Luthier here in out country) i asked the Luthier to make a dummy pickup for me, so he ripped a cheap humbucker pickup and he attached the driver to it making it a "humbucker" but the dummy isn't connected whatsoever.
No the problem is the strings will sustain no problem in the standard mode, but it's having a hard time having the "Harmonic Mode" work properly on the treble string (E1, B2, G3). is there anything that i can do to fix this?