sourcing mapGarbage Disposal Air Switch Button 32mm Dia 304 Stainless Steel Self Locking for Sink Top Waste Disposer

This is mounted in my kitchen sink surround as it is supposed to be but very often the button sticks in the down/on position and I have to go under the sink and disconnect the air pipe in order to turn off the Insinkerator. It needs a smoother lining of the surround that the button moves up and down in. It looks good but only works smoothly about 50% of the time.