@PaulE : The white 'buttons' on the side do come out (maybe don't 'need' to but I did), get something under them pry and they should pop out easily, just have little 3 little leg pins holding them in there.
Not seen the corners with the extra retainer, that seems like a much better idea! If you have the old type, heating the legs up with a heat gun or hairdryer for a few seconds first will help them flex a bit and make them less likely to snap off... wish I thought of that that the first time I tried!
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