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I replaced the conical screw with a standard 6 point version. I can get more torque on it than the socket style. I also drilled a relief in the coupler itself so the screw goes below the surface.
I have not had mine loosen up at all after this mod. You can always add a bit of Loc-tite blue for extra security.
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1981 911SC ROW SOLD - JULY 2015
Pacific Blue
Wayne
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