I am currently flying a H9 330L 1/3 scale Extra with a ZDZ 80.
The ailerons are counterbalanced with a 2oz lead wt on a rod 4" ahead of the hinge point at the tip. The wt is outside of the tip that in this case is not rounded. The aileron is controlled by one Futaba 9250 digital servo on each wing.
On about the 17th flight, while assembling the airplane it fell off the table and broke the plastic gear in one of the servos. I remember checking the controls and it seemed to be ok. However in the flight it didn't seem to respond like it should so I landed. i found the servo was completely loose with the aileron free to move as it wished. There was no flutter.
I called Futaba and asked if they would send me some new plastic gears because I didn't want to pay $54 for a gear set for this servo that contained the metal gears.
They sent the gears by UPS air as I was going to an IMAA meet on Sat. Unfortunately this was Monday Sept 10'th.
At the meet, since since I had no gears, I tried to replace the gear with one I got out of an old servo. It seemed to fit. I put the servo in and tested it by moving the control back and forth for ten minutes.
I took the airplane off. After about 1 minute I again noticed a loss of sensitivity in the aileron control. I landed and found the servo had broken the gear. Again there was no evidence of flutter.
After I received and installed the new gears, I have flown the aircraft about 25 times without incident.
To me this proves the effectiveness of the lead wt.