That really helped me understand a lot and followed your example to understand how to do this accurately.....I am sure there are other ways to do the same thing...but the screencast is an amazing learning tool!
I was able to verify a needed dimension by drawing a line roughly where the INSIDE ARCs touch the round bodies and then a line perpendicular to the middle of the curved body to get a measurement....i could not figure out any other way to do this--what I want is a 14mm distance but it is less than that right now...
You said to avoid using the MOVE function, but I need move the curved body up a few mm.
I remember moving this around before and it would change shape. Is there a way to constrain the dimentions after it has already been built? I was lucky that it fell in to place as close as it did as I was looking for 2.5mm thick and 4.5mm wide.
The other thing I noticed was the curved body protrudes into the LEFT round body's hole ever so slightly....another reason I need to move this thing around.