There was a new AD the year I bought my Archer about cracks in the turnbuckle connecting the stabilator. A&P just replaced it, I believe the original AD said to use dye penetrant or something like that to look for cracks but the part was cheaper than doing all that.
I've always picked up the stabilator on every pre-flight and looked in at what portion of the mechanism I can see, it always looks the same with a light coat of grease and everything connected so I guess it's good.
That was an interesting AD as It seemed to me that it was the result of poor inspection practices rather than any particular problem with the turnbuckles. The AD required cleaning and inspection for corrosion, cracks or broken cable strands using 10x magnification. Dye penetrant inspection is not required. Since the cable ends had to be inspected most of the cleaning work was required. Replacing the turnbuckle body seems like an interesting way to comply. Anyway as I understand it the cables and turnbuckles should be inspected during the annual anyway. Maybe other folks see it differently.
The actual text of the SB referenced by the AD:
5. Clean the turnbuckle bodies and associated cable terminals thoroughly with Methyl Ethyl Ketone (MEK) or acetone prior to inspection. The non-threaded surfaces of the turnbuckle body and cable terminals may be cleaned using Scotch-Brite™ General Purpose Green Scouring Pad 96 or 105b. NOTE: Most of the affected aircraft use control cables featuring strands made of galvanized steel. By design, the galvanized coating corrodes sacrificially, protecting the steel strands underneath. This normal corrosion process creates zinc oxide powder, which can migrate along the length of the control cable, covering the surfaces of the turnbuckle components with an inert white speckled coating. This coating, along with any other contaminants such as dirt, oil or grease, must be removed in order to properly examine the turnbuckle and cable terminals.
6. Using a 10X magnifier, a mirror and a suitable light source, carefully examine the entire surface of each turnbuckle, cable terminal, and adjacent portion of the flight control cable, inspecting for cracks, corrosion, or broken cable strands. Any evidence of cracks or cable fraying, however minute, is cause for replacement. Any evidence of corrosion that remains after accomplishing the cleaning instructions above is cause for replacement.