Just email them on the "contact us" - they're pretty quick at replying. Only thing I would say is their usual response to mast questions is:
"We don't know the mast flex properties of "....." masts so we can really only recommend our own masts".
Probably worth waiting on here to see if other masts work.
Thats why all the maunfacturers should state their mast bend curves...what are they hiding and why? someone had already asked a similar question and Monty's response was to try it. www.unifiber.net/masts-selector
Carl I would say it wouldn't work too well as it at the other side of the scale towards hardtop, but then I seen people do crazier things like rig a flex top mast in a hardtop sail the complete opposite end of the scale and says it works so buggers me sometimes.
agree snags those confirmation codes can be hard to read at times.
