My builder was having trouble aligning the pipe with a bellmouth I got from Grumania. The pipe is cut at an angle. Since my mibo kit already comes with the angle build in the rails, the cut is no longer needed and its harder to align with it.
I did a jig via 3d printing. It seems to do the work, but will know in the next few days.
(Note: I use a carbon fiber tube to align the rod. The one I had was used for other stuff, so that is why there is a clothespin on it 8-)
