Is this it?
http://www.truturn.com/cgi-bin/store...adaptprecision
If so just measure the adapter O.D. of the adapter which fits inside the prop. I bet your prop needs to be reamed to 12mm. See post #12 for reamer to use.
ORIGINAL: por924
The adapter is the tru turn adapter and it has an ID of 12mm so I would guess that the OD is 13mm or 14mm but I can't find those size drill bits anywhere and the body reamers for the cars are tapered so they wouldn't work. What do you think guys?