This is still a work in progress but this is version 1 of my concept. Everything seems to work but I am waiting on some dial indicator extensions so It's long enough to pass through the effector. The point of this exercise what that I wanted to use a dial indicator for truing my towers (radius) but I didn't want to take apart the hot end. I plan to remove the dial indicator when done and just leave the bracket installed. The dial indicator is not centered but I have it as close as I can get it to the nozzle. You will need a longer #6-32 machine screw. I bought a 2" long and cut it down to size. You might also to to trim a little plastic off of the PEEK fan shroud if the indicator post interferes.

None really. I printed mine out of PLA with support material. The bracket has a hole size for a .373" pin sleeve. It should be a light press fit. You will need to tap the small hole on the side with a #6-32. I didn't have a set screw so just used what I could find. You won't need to get the screw really tight. Just a little snug (so it doesn't strip). You will also need to get some dial indicator extensions. I think I picked up a set from ebay for $8 in various lengths. Solid model supplied in case you need to alter it.

Attribution - Creative Commons