I have the 615s installed in my TF 60 Corsair. As of this post I haven't flown or even taxied it yet. I did put flat spots on the strut below the toothed gear to keep the gear from rotating (which is recommended by Robart). I can't seem to get the set screws as tight as I would like without the allen wrench slipping in the screw. New allen wrench.
Thanks for bringing up the trunion problem. I was thinking of solderring the toothed gear to the strut and eliminate the need of the set screw altogether. Also I was contemplating drilling the trunion and inserting a brass bushing to keep the plastic from wearing.
It just irks me to have to do all these mods to a new set of retracts when the Manufacturer knows of the persistent problems users are having. It also irks me that Robart can't put a flat spot on the bottom of the strut where the toothed gear is tightened to it.
I hate to deal with taking apart new retracts to "fix" something so simple for the manufacturer to do.
My $.02

Tom