The entire handle and knob was missing. The company asks that you email them (no telephone number to call) 
So I sent a picture and asked for a new top. It took a long time to arrive from Wayfair too. We ordered two computer desks and a filing cabinet after the umbrella and everything else came before the umbrella.

Waited and it is useless until I get the parts to crank up the umbrella, not happy at all,
Rose Hankinson