Just got back from Cuscowilla after spending two days with Lynn. We spent the majority of our time discussing and working on putting and shots around the green, as well as pitching and sand play.
Lynn is convinced, and I agree, that Runyan's fundamentals are the most consistent and easiest to apply when it comes to the short game. Opposing grip, ball off the left big toe, eyes over the ball and head centered between the feet are the basics for putting. Adjustment for shots around the green involve ball position and club shaft lean. I'd recommend picking up Runyan's book, "The Short Way to Lower Scoring", and/or "Short Game for Seniors" to anyone interested in making improvements to their short game (or a trip to Cuscowilla).
Lynn has also devised a practice program for the short game that is very effective. As a testimonial, my short game (putting in particular) has never been my strong suit - played yesterday and put in the new putting and chipping/pitching techniques for the first time and made seven birdies!!
If you can, get to Cuscowilla and spend a day with Lynn on the short game - you'll be glad you did!!