IIRC.
To clarify what Adam has written
If you put a washer under the front bolt head it completely locks the system out as it removes ALL movement.
At that point the rear screw with the rubber bush is only there to locate the brace, nothing more, the front bolt has effectively locked the flex out.
If you remove the front washer, you then allow the brace to move by the thickness of the washer, the shank on the bolt prevents you tightening it down against the brace, you are only tightening down against the side pod.
The movement is then controlled by the rubber bush, more preload = less motion/flex.
So you are adding washers to the bush stack to reduce flex. (And removing to increase flex)
Hope that is clearer for you.
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