The my shafts are about 13cm from pin to tip (+\- approx. 1\2-1 mm) and my shafts work just as JThiessen described above. and yes according to losi the 2.0 arms are supposed to be a couple millimeters longer than the 1.0. they also look slightly different
1.0 arms
http://www.horizonhobby.com/Products...rodID=LOSA1702
2.0 arms
http://www.horizonhobby.com/Products...rodID=LOSA1704
Hope this helps!