Reply to myself - most of that is in the previously linked L'hotellier maintenance instructions. My post was incorrect, replace all balls at 10yrs/3000hrs.

Cheers Ben

On Thursday, 14 April 2016 09:22:43 UTC+10, Ben Coleman wrote:
In Australia AD177 covers L'hotellier couplings. 1000hr replacement for shanks under 6mm, 3000hr for others on flap and dive brake circuits. 0.1mm max difference between different axes of ball at 90 degrees to each other - like an X through the cross section (best to look at the diagram!). Lubrication each rigging, 50hrs and 6 months. There's a bunch of other stuff in there too, but not sure how much is Oz specific vs out of manufacturer ADs.

Cheers Ben