I’ve debated the exact same question... just in relation to an alloy FSA Metropolis stem with the tall stack and single pinch bolt. It fits perfectly on a previous build with threadless fork (protruding a few mm above steerer and stock compression bolt reaching as designed) but when I tried to fit a spacer with bell mount it pushed the stem up further than I was comfortable with and the stem being fully hollow inside revealed what then looked like too little structural support for the hollowed out extension. That was just my uneducated observation so I removed the bell and spacer to drop the stem back down flush with headset. I know VO and Crust had stated min/max steerer heights for their cromo LD stems... not sure if VO states a minimum insert for their similar tall stack alloy threadless stems though. Should take a look and either way I’d assume the cromo versions may be a little more forgiving without being completely hollow like the alloy variety I have.
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