You often find over time the QX frames get propolised to the brood box. Get into the habit of easing the hive tool under it and then running round at least three sides to free it before gently lifting it up.
It will save the corner joints and make the frame last a lot longer. You often see people simply free one corner then use force to lever up the remainder before it cracks free. The twisting forces are pretty high and will lead to the framed excluder failing before its time. It also can “ping” off bees and give the box a slight jolt, which is hardly helpful as a first hello to the bees. Takes seconds when it’s a habit.
If you have a colony that are real propolisers you can even give the underside of the frame a smear of Vaseline to prevent it getting stuck down - though I will be honest and admit I didn’t manage to keep doing it very long
Always take a moment before using a wired excluder to check all the wires are exactly parallel. Newly mated queens are particularly crafty at discovering imperfect gaps and squeezing through to end up laying in the supers. More than once a “disappeared” queens in “queenless” hives has eventually been found merrily laying in supers. A right pain in the proverbial which can also happen with slotted steel excluders if they get bent slightly.
