I'm overhauling a used jet (PST composite Reaction) I just bought, and notice some slop in the control surfaces.  I'm seeing about 1/16"-3/32" of play at the TE of a 2 1/2" control surface.

So, I'm getting slop mainly from: (1) servo metal gear backlash and (2) Control surface composite horn hole wear.  I can replace the servo or servo gear train, and I can find a clevis with a thicker pin. I get that, but that's not the intent of my question. 

 I know zero slop is best and desired, but as a jet ages, what is acceptable slop before I need to take action?  Does anyone have any experience with this?

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Sounds reasonable. general rule of thumb i use is this. keep the clevis on the surface as far out as reasonably possible, then put the servo clevis as far in as possible while maintaining the desired travel. You want the servo's travel to be 90% or greater. Obviously there are exceptions, but this will keep torque up, slop minimized and push rod loads minimized. I have greatly simplified this, but like I said "general rule of thumb".

If you notice the slop is getting worse, replace the part(s) that are causing the issue. your jet is talking to you!

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