I can't see this sunken screw and I'm afraid I will strip it. What is it? Torx 8, hex or what? I was

I can't see this sunken screw and I'm afraid I will strip it. What is it? Torx 8, hex or what?
I was finally able to fix the thumping noise/feel when at max spring force and moving full fwd/aft. This screw was just a little too loose. It was not my extension as I thought before. Thank you for pointing me to the right direction.
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