If you find yourself confronted with a screw that is extremely difficult to get unscrewed, don’t use brute force (or you risk stripping the threads). Instead, give the screw a slight twist in the opposite direction and then loose it again. If this does not help, tap the screwdriver on the head with a small hammer (but don’t tap it too hard). If it still fails to make it, try to squirt the screw with penetrating oil or WD-40 and retry.
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