When reinstalling the drawer, fully extend both outer slides in the box. Insert the inner slides on the side of the drawer in between the outer slides and shut the drawer until you hear the slides snap together. Older Snap-On toolboxes that do not have ball bearing glides require a thin piece of metal to slide in between the slide and the side of the drawer to remove the drawer.
Many professional and home mechanics choose Snap-On toolboxes to store their tools. Snap-On now uses ball bearing slides for the toolboxes that prevent the drawer from falling out of the box while maintaining a smooth operation. Occasionally, though, tools fall behind the drawers requiring drawer removal to grab the tool. Removing the drawers from a Snap-On toolbox with ball bearing slides is literally a snap compared to other types of toolbox drawers.
Open the Snap-On toolbox drawer and remove the tools from the drawer. Fully extend the drawer until you see the clip tabs on each outer slide.
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Press the end of the clip tab up on one side with a flat-head screwdriver and pull the drawer until the inner slide stop is past the clip.
Repeat for the other side of the drawer and slide the drawer out of the toolbox.