My 2.10 came in the mail today . That crankshaft does look a bit short.

Yep, the spinner backplate has to be reamed to 12mm for the 2.10 and apparently the 1.8 as well (according to the Moki Manuals). The Tru-Turn site recommends that they do this work. I guess your best bet is to order a spinner directly from them and have them do the machining on the backplate before they ship it (assuming you want a Tru-Turn spinner).

Moses

edit: typo