I've had this pickup on my Epiphone EB0 bass for about two months and I'm having a problem with equal volume levels across the 4 strings. I've tried to adjust the poles, but they don't seem to want to turn. Matter of fact, I just snapped off the allen wrench that's provided with the pickup. What's the problem with this??
Mine were stiff, but they popped free with some force applied. Maybe you need a better quality Allen wrench? A little heat from a soldering iron might help too, but not too much. Or, since metal shrinks at low temperatures, try putting it in a sealed plastic bag then putting it in the freezer overnight. If the pole shrinks enough it should turn a little easier.