Bare Knuckle Pickups The Mule and Nailbomb. For 6-string guitars, The Mule is for the neck position and the Nailbomb is for the bridge position. Both are 4-conductor, short-leg, and aged. The Nailbomb is F-spaced. There are boxes, but one is missing the included screws and springs. A pickguard was created and aged based on the pickguard included with the EMG Steve Lukather SL20 pickups, and wired with Bare Knuckle Pickups pots, capacitors, and switch. I am not currently considering lowering the price. Returns are not accepted for used items.