getting camshaft duration numbers on an out of engine cam

saw a posting that mentioned using a V block set up to measure duration @.050 and @.002 on a cam shaft out of an engine.
I know how to use a degree wheel to set the cam timing on an installed cam.

to save me from having to re invent this, can some one post a description and photos of their set up for checking a cam on a bench.
Do you attach a degree wheel to the front of the cam?