anyone using bk tail servo with a strechh x4ii?

[anthony1]

I have been having some issues with my tail on my x4ii stretch running 500 mm blades , the tail will buzz(wag) at odd times , I was thinking that it was my batteries because it seemed like it would buzz at the exit of a maneuver when the head unloads a little, a couple of weeks ago I decided to change the servo as I had to reduce my tail gain nearly every time I flew , only one or 2 points but it wasn't that high to start with , anyway with the new servo , I had another bk lying around but that's a different story , the tail was back to where it was , I sent the old (not yet a year old )servo back to bk and they said that there was something wrong with it and replaced it (great customer service btw) but this morning which is about the 5th flight on the new servo it started to buzz again, not a big problem but near the end of the flight the tail let go , of course I was inverted and low(about 30 feet) which resulted in an inverted auto onto the head button , actually nearly everything survived except the boom(major bend) and the feathering shaft, blades ,servo's etc all seem good as it was power off and the blades weren't spinning,
so my question is do I risk another bk servo? I have the new replacement from bk but this will be the third time in a couple of months , am I just unlucky or has anyone else had a similar problem?
Anthony

[AUS_Gremlin]

Have one installed on X3l and X4II stretched (X5) boom - not had a problem with these, have had one BK tail servo DOA which was replaced.

Run BK cyclics on 3 different helis, not had an issue

[anthony1]

good to know ,
Anthony