I have added proper photos to the twin collective assembly manual, it looks really detailed now. You can also use it to build the single throttle lever, as they are very similar. I recommend looking at Peter’s single collective build log as well!
It probably needs some editing but is quite detailed where I think it’s important and should be helpful when building a new gimbal.
The new assembly manual is here! It’s been written right in the process of building the lever, so every smallest step is there to avoid possible issues. Follow it carefully, and you should have no problems assembling the lever!