Try purchasing some Torx from someone like Mcmaster Carr. Have you looked at your wrench lately. If the edges are not sharp and square you need to throw it away and purchase a new one. If not you will damage all of your other screws will become damaged by the worn wrench. I replace screws that are rounded as soon as it happens in that event the wrench wrench is already damaged by stripping the head. I replace the wrench or all of my screws that size will soon be damaged. It's a landslide.
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