There are three shafts -- best to measure the diameter exactly:
1) Stock shaft (part 1-92709) is roughly 4mm or 5/32 inch. You can get it from http://www.shopatron.com/product/pr...MC1-92709/113.0
or from Roffee's Hobby: phone 740-685-8586. Or ... You can find 5/32" diameter music wire at the hardware store and cut it down to proper lengths and grind out the top flat.
2) 5-mm Titanium shaft from Ballistic Technology. (Titanium shaft is shinier than the steal shaft and is very flexible.)
3) 7-mm Titanium shaft from Ballistic Technology
You can get CF feather plate from Ballistic Technology http://www.ballistictechnology.com,
contact Matt Shumaker at email@example.com
You can also try http://www.helihobby.com/html/lmh_upgrades.html,
but a lot of people avoid them.