I can't remember what happened to the handle (knob) on the wok steamer lid, nor what it looked like, but when it died/disintegrated/escaped/was stolen, I replaced it with a piece of 1" dowel (aka broomhandle). I cut a piece about 3cm long and screwed it in from underneath. It's been good for the last 7 years or so and, if it dies (etc) will be easy to replace.