Thanks @MCamb - all sorted now. Would that work? I can't seem to get my head around the physics!
Put the other stem on above the one you want to keep, install top cap (compresses headset), tighten bottom stem (keeps the system compressed), remove top cap, remove top stem, install top cap.
@Adhiero started
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Thanks @MCamb - all sorted now. Would that work? I can't seem to get my head around the physics!