Re-assembly tip—Follow this step to re-seat the plunger.

Use your fingers to push the black plunger down towards the bottom of the handle into position. This may take significant force.

Once the plunger slips into position, squeeze the the two handle halves together.

If done correctly, the handle should close tightly without a gap and lock the plunger in place.

If that doesn't happen, check to see if the plunger is properly positioned, and that no wires are pinched.

Continue squeezing the two handle halves together while you reinstall the handle's lower screws.