Fix for Spray Head Function on Dorf Oasis Veggie Spray Sink Mixer

The rubber cover over the spray button of the Dorf Oasis Veggie Spray Sink Mixer tap cracks after a few years use. This appears to be a design fault with the hard plastic lever which controls water flow tending to push through the rubber cover. After having one tap and a replacement both have the rubber split, I found I could repair the rubber with black silicon rubber cement. To reinforce the button I used the silicon rubber cement to stick a small patch of silicon self amalgamating tape both the top and under the button. But I wonder if it is worth the effort. While useful, these type of spray mixed faucets are too complex to be reliable.