Adjustable caster 1 Remove the front cover, the back cover, and the foot cover. 2 Lay the stapler/stacker on its front or back side so that the caster being replaced is off the floor. 3 Use a flat blade screwdriver to snap the e-clip off of the adjusting knob (callout 1). 21 Figure 211. Adjustable caster removal 4 Slide the caster out of its position. EN 3,000-sheet stapler/stacker and 3,000-sheet stacker 361