To check the clocking of holes in tubes, we recommend that you create plugs that insert in the hole. Make the plug at least a couple of inches long.
Then create a master tube with the shape that finishes with the plug as the last or first leg. The radius for the pseudo bend can be anything non-zero - like 0.1.
Then measure that part of the tube to learn the clocking to the previous bend angle.
You can use the VIEW TRANSFORM control to reorient the new master tube so that the view is looking down the appropriate straight.
