[Patrick O'Hara]

I would say that Jack was a "hitter" with his putting stroke and used angle hinging, the putter face was across his plane line. But I would like others to chime in on this one.
Not many horizontal hinges out there with the good putter these days but maybe I'm missing a few. Angle hinging to me makes the most sense but I'm searching right now too!
Vertical hinging is a manipulation of the putter head and to me not very reliable.
Just the ramblings of a dressed up caddy with his brains beat out.