410 stroker build part 2

Got a question....I see the tool being used to degree in camshaft...It looks like the flat tappet attachment is being used to ride on the cam lobe....the tool I got from Comp has a different attachment for a roller cam...or am I seeing wrong...just a question....
Not real sure I'd have to ask my buddy. These are his tools but I do know it just goes in the lifter bore and expands to tighten so it doesn't move. We used it to find max lift. He used this on his last roller build seems to work good