Of course this is all theory as I haven't actually measured the diameter of the Mezzo stem. If its smaller than an A head steerer tube then it could be packed out with a spacer.
Good news. Just measured Mezzo stem and its 25.4mm or 1" diameter so a stem and tube of that size will drop straight in.
Last edited by cpg; 09-23-13 at 04:45 PM.
Reason: Added stem diameter