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Finding the hidden screw or screw bolts that hold a push button lid on (usually just one) and what happens if you do not undo the screw first.Not the video you were looking for? Save further searching. We have over 350 plumbing/heating videos that you really can do yourself! There is also an ask `AL tab` tab on our website. www.dereton33.com. For mobile phones www.dereton33.co.uk