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Its basically just got a dot in the top of it. You knock the torx bit down into it to force it to the shape of the bit so you can turn it. I guess you could use a t18, but Ive heard t15 also.
yeah, tried just the torx... stripped it out, chiseled a flat head, screw driver didnt do the trick so i wound up using the chisel and hammer to turn the screw out, it comes out eventually