I think that as soon as you get even a small extension of the bolt due to tensile stress, you get a lateral movement of the 2 parts of the block (bottom backward, top forward?) which introduces a shear element
Ah yes, that would make sense - was thinking the saddle rails might constrain this, but in mechanical engineering everything is rubber and all that.
@Thrustvector started
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I think that as soon as you get even a small extension of the bolt due to tensile stress, you get a lateral movement of the 2 parts of the block (bottom backward, top forward?) which introduces a shear element