Make sure you get good parts. This is something that requires specific tolerances and the cheap stuff will most likely cause you to do this all over again
I will just show you once, but it's the same thing repeated 4 times
Now comes the tricky part. Not too bad but time consuming
I then tightened the screw until tight counting turns. When you install the new one you will turn it until tight then back off the appropriate amount of turns stopping on your grooves.
You shouldn't need to flow test them since you didn't separate them or adjust the butterfly at all.