I have a GY401 and Futaba 9253 on the tail, I cannot get the servo to stop singing when I connect the servo horn, have tried five different servo horns, realigning the push rod, everything I can think of, it will stop singing without the servo horn and rod attached, once I put it on and move the stick it sings..... there is some play in the shaft of the servo, about 2 mm up and down when the servo is placed facing flat down. Is this normal, is the servo bad or the alignment: Am using this on a Venture 30 with JR 8103 digital, confused: Thanks for any help.......