Nuts Screw Sort

Empty the bolts. Fill the screws. Clear the board. Tap a bolt, watch the nuts tumble out onto the conveyor, and let them thread onto the matching screw. Easy to pick up but every bolt you open reshapes the puzzle. Three matching nuts complete a screw. Sounds simple. Then the belt fills up, the wrong colors keep coming, and the bolt you needed was buried behind the one you just opened.