Whenever you set up for this shot be sure to make a few practice swings to check the position of your scuff marks on the ground. At address you want your ball to be centered in the area that your clubhead normally scuffs which will give you the cleanest contact possible through impact. It’s not all automatic however — it’s still up to you to figure out how the ball will break and roll after it hits the green.
And not insignificantly — it’s six times more important. Even if your path is good unduly opening or closing the face at impact spells doom. Catching putts across the face produces varying ball speeds. Find one impact point. My recommendation: the sweet spot.
That’s the saw’s primary advantage. It automatically removes any temptation to rotate the putterface through impact and almost assures a square strike. Granted the saw grip won’t work for everyone (remember we’re all different).