Under normal circumstances where the FBL is set up correctly, any slop in the tail would result in more of a wagging condition. Spinning uncontrollably one direction or another may suggest an orientation or servo direction problem at either the FBL or the Tx. ........ don't ask me how I know that.

 

Yes but doesn't slop mean that the blades aren't able to turn accurately enough to thrust enough air to compensate the spinning torque .
Because the slop is non existent on my other helicopters and they run beautifully.

 

Here's a pic of my tail with all the stripped plastic resulting in tail slop.

 

Slop...... Are you saying that the linkage between the servo and the tail blades has some slack, or are you saying it feels "sloppy" in how the rudder control feels?- I.e...... Is tail blowing out or not staying locked in?

 

The tail is not bowing no. I got that all figured out . like you said the tail parts have some slack because there is plastic and metal and metal strips out the plastic creating all this extra play in the linkages. You can actually move it by hand

 

Beaver can picture how this may look.

 

You say you can move the tail blades.... slack. Do you mean rotationally as in slack in the torque tube/tail gears, or do you mean slop in the tail pitch assembly where the blades aren't accurately holding pitch according to servo movement?
That might narrow the parameters a bit for me.

 

Yes the blades aren't able to hold a proper pitch due to the excessive play.

 

I can't say for sure, but seems I've heard reports of the pitch slider and linkage being a bit dodgy on some of the earlier kits. Is that where the slack is located?

 

Yes the tail slider when moved doesn't move without tiny wobble like excessive play. plus the pitch fork the party that holds the actual blade have some play. overall like you said she cant hold a pitch.

 

Hard to say without actually seeing it, but you might consider that as being one of those parts that could be upgraded with a genuine SAB part.