best putting drill/aid

[sasquatcho69]

i've recently been working alot on putting, because i need to shave off about 5-10 strokes for golf season, and i was wondering if anybody has found any putting drills, practica aids, etc., that have dramatically improved your putting. i was thinking about getting the inside-down-the-line putting aid to replace the yard stick that i prop up with tees.
thanks

[Wahoo]

I got the Putting Arc for Christmas (which is similar to the product you reference, but promotes an inside-to-inside stroke), and I have found it helpful for grooving my stroke in my living room. We'll see how to translates to the course.