which pinion is best??
 

hello everybody. just a quickie! i need to know which pinion would be best for my soon arrive GT450 (gootchrc.com )Does any one also bought the helis from this company?.Yesterday i just got the video from net : http://player.youku.com/player.php/sid/XMTU4OTQ1ODc2/v.swf (someone's flying test ).the motor is a mystery 3500 with a 3.17mm width shaft diameter.i cant seem to find a pinion with that width hole so thought i'd better ask here. thankyou.