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Hello, you seem to be spamming the question, I do not know if you are aware of this , but it's in the list 5 times.Welcome to JA/Pearl, my name is***** and I will try to help u today
generally when changing bulbs I will turn the switch off, carefully align the bulb so I can make use of tiny pin holes near the tombstones ( the holes allow you to put the bulb into the fixture without forcing anything due to the length of the bulb, from there you turn the bulb so the pins are parallel with the slot of the tombstone and push into one side , clearing the pins that were in the placement holes of the fixture, this enables me to slide the tube down into the opposite tombstone, once the bulb is in the tombstone with the connection pins vertically and inside the slots of the tombstones on each end , you turn the buld half turn until you hear the tombstones "click" and lock the bulb in place. I will try to find pictures if you need more assistance.
You can leave the switch on and replace the bulb if you feel that helps you.
This is a great video showing what I explained
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