Thanks all for the detail relating to the clutch slave brace, very interesting it does open up possible opportunities. Not sure why you felt it was necessary to use fine threads unless you felt it was unpredictable to lock the arrangement without it slipping.

Back to the theory though..
As OEM the line of force will be following the slave rod. Without watching it deflect I can’t see what bends and how. But with the device fitted  as shown in the drawings the resisting force is not in line with the axis of the slave push rod.. Any resisting force might tend to bend the slave rod I would have thought.

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