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@gbj_tester
Give DJ the points for getting the right answer. Placing the clamping bolt(s) at the back of the steerer means that the twisting of the extension, which tends to open up the clamp, gets translated into a nearly pure tensile load on the clamp bolt(s) by the camming action of the steerer in the split clamp. With the bolt at the side, twisting the extension will place a very large shearing load on the bolt in addition to the usual increase in tension.