Get the HGI yank eliminator. What engine you have. There's nothing that goes on the engine shaft making better performance because your engine doesn't have to turn any other attachment. YOu need a drill and the Yank eliminator and you go. HERE
For the 8mm shaft.
http://www2.towerhobbies.com/cgi-bin...&I=LXSN77&P=ML
Or the 6mm shaft.
http://www2.towerhobbies.com/cgi-bin...&I=LXSG87&P=ML
THe drill.
http://shop3.outpost.com/product/385...H:MAIN_RSLT_PG