Centre Finder

Decided to design this in Fusion 360 after seeing a similar one in use in 3D Nerds Youtube Video with Bill Doran from Punished Props Academy.
https://www.youtube.com/watch?v=s1q2D_pK0BE (Well worth watching).Item in question was used at 15:30 in the video if you want to see how it is used.
As an Engineer I own a couple of steel versions of different sizes.
Would suggest it is printed from the hardest filament you have and probably a solid print would be best.
Constructive criticism is welcome.