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I'm no engineer, but the center of a t-bar doesn't do much. Hence why you can get hollow ones that only need a slight diameter increase to have the same stiffness as a solid one of slightly smaller diameter. The surface is where the most stress / strain is. I would think a small centered threaded hole wouldn't have much of an adverse effect, especially if it doesn't extend past the splined section of the bar.
Again, not an engineer, so huge grain of salt.
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Matt - 84 Carrera
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