Not intending to muddy up the water, here,
but does anyone else here putt with overspin?
I got the idea years ago, reading the
legendary gambler, Titanic Thompson. He
said it was his secret. Years later, after finally
getting nerve to try it, I did, and never looked
back.
(Briefly, all you do is contact the ball above
its "equator." If there is a "trick" to it, it's that the
contact point on the club is the leading edge
of the sole.)