If I take my putting stroke to Followthrough (both arms straight) I horizontally hinge.
My stroke is kinda in limbo tho...still in tinkering mode...could settle on angled with more experimentation...I've been neglecting my putting lately...gotta get on track.
Sounds like you use mostly a hands/arms motion vs. a shoulder motion?
You know what man...I don't.
And I don't think what I said earlier is right anymore.
When I was thinking it was a HHinge I was extending my putting stroke to more of a full swing and adding a fuller pivot....it was in fact a HHinge....
...but that's not a real comparison really...because you don't use much if any pivot in putting.
So with arm/shoulder swing only and a stable/non-turning body and it's an AHinge.