Reply to vci-100 knob question

seven of my eight eq knobs have a definite middle position where they sit recognizably at 0. something is wrong with the eighth knob so its difficult to FEEL where the middle is. it wouldnt really matter so much if it werent a filter knob and any degree from 0 or off in this case can easily be heard.

anyone with vci mod experience know how to fix this?