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Matt
You didn't mention in the original post you were using Bob's Knob's. It is virtually impossible to overtighten them, the SCT's I had were kept a good finger tight, in other words, tight enough so a reasonable amount of force was required to move them, the design of the secondary is that an aluminium plate moves on a dimple and the adjustment is vide the 3 knobs. If you tighten them up so tight as to not be able to move, you will get a 3 lobed effect and you will stress the secondary.
JohnG
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