i just put $200.00 into this heli in an atempt fly it but i resently learnd that the TAIL DRIVE COUPLING was striped and i need a new one but i cant find the part for the dx modle anywher i did however find it for the sr modle if this will work on both please say so or if you now a easy way of seting up the picth with a 4 channel remote. thanx mike