pulling cover off = pulling on the metal
pushing the cover on while the reader is face-down = pushing on the glass when the glass has air under it
so actually, i'd say the best advice is sort of the inverse of Bob's. lay the cover first on a hard surface and then place the reader face up, pushing on the middle of the glass with your findgers till it snaps. counter-intuitive, but the force will be on the glass either way and i think this way is better.
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