GC Electronics makes/made wrenches for this purpose. GC #9358 for 1/2" nuts GC #9359 for 5/8" nuts Also, http://www.allparts.com/Toggle-Switch-Wrench-p/lt-4201-023.htm http://www.stewmac.com/shop/Electronics,_pickups/Tools:_Toggle_switch_wrench.html Grant/NQ5T