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Everytime I attempt to put the screw back into the battery cover,the screw seems to change polarity flip upside down or jump out and stick to the side of the case.. Is there a good tip /technique to doing this I wonder? I’ve got this far after first time battery and display renewal,so this is infuriating to say the least !!

Magnetize a Screwdriver the screws will then go to the screwdriver One way and may explain the theory https://www.wikihow.com/Magnetize-a-Scre