Aaron- Most levers push the string against a bar of some kind when engaged. When the lever is not engaged, the string should sit half way between the lever and the bar. If the column has warped a little, then the string may sit too close to the disengaged lever. If that is the case, then the adjustment is to hammer in the string post above the lever to move the string a little more away from the lever.
Look at the problem string with the lever in the “off” position and see how close to the lever the string is sitting. If it is too close, then hammer the string post in slightly and check the distance again. The string cannot be too close to either the open lever or the metal bar or you’ll get buzzes when the lever is not engaged.