I do this on steel and alu steerers.
i know the clamping bolts are below the top of the stem.
The point with the SI steerer and top cap is that the bung and top cap is used as a brace to resist the clamping forces of the stem. The bung and top cap reinforcer must be where the stem clamp is - hence no spacers.
Thanks Cannondale etc
@Howard started
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I do this on steel and alu steerers.
i know the clamping bolts are below the top of the stem.