Now you can test how well the handle retracts. Does it easily retract all the way? How about extending? When retracting, you only need to press on the button when the handle is fully retracted. At the halfway point, you mere need to push down on the top of the handle to get the middle shaft to retract.

Hmmm.. things weren't too smooth for me, so I'll lubricate the pin that's sticking out of the outer shaft. It looks like there's a bit of deformation of the hole. i guess someone was trying to force it.