I ran into another Sling gotcha last week, and this one is a serious safety problem if you build it wrong (like mine was).
Recently they redesigned the elevator pushrod guide block assembly for the Sling 2 (and I think also for the Sling 4 and Sling TSI). This is on page F7 of the Sling 2 manual and as usual the manuals have not been updated with this change. I purchased my fuselage as a quick build so didn’t install this guide block, but last week when installing the elevator pushrod I knew that something was major wrong. The pushrod would catch and release and had way too much friction. I don’t think that an airplane in this condition would be flyable.
The new bracket has a taper so that the pushrod and the bushing are aligned, but in my case they installed the bracket upside down so that the pushrod was at an angle to the bushing. You can see that in the 1st 2 pictures that I uploaded.
I was able to get a CAD drawing from the factory that shows how it should be installed. Also is a image of mine after I turned it around and have it almost fixed.
What a pain to fix it with the fuselage already put together. You have only the access hole in the bottom to work through. I used a small camera hooked to my laptop so I could position my drill to drill out the top 3 rivets, punch them out and re-rivet it.
What a drastic change once the bracket was installed correctly, night & day difference.
Totally unacceptable that the factory is making design changes without having documentation released at the same time.
Here are images showing both the wrong and the correct orientations.
Correct CAD drawing
View from camera to aid drilling out top rivets