You could try this one
http://www.lightflightrc.com/HTML/pr...RC-28-47-1.htm. It has a 3.17mm shaft, is a 4 pole and the magnets are wrapped with Kevlar. If any of you go with them, tell Dave I mentioned his products to you guys
. Also, look into these:
http://www.highendrc.com/index_ecat.php?cPath=8.