Funny, no matter how much you KNOW you have your grip right, if you re-read something years later about fundamentals with a wider range of knowledge and understanding of concepts/terminology, you may find something very important that you missed.
When I first read the article on grip on the DGR site years ago, I somehow misunderstood it and have been creating my main rip point by squeezing "like a mofo" between my index finger and thumb. I read the Feldberg grip article, saw that it said pull into the palm, and said nothing about thumb pressure, and was curious...then reread the DGR article, and realized I've been doing it wrong all along.
I wonder how much this has hurt my throws? Can't wait until the freezing rain stops so I can try my new rip point inwards between index and seam of palm, as opposed to upwards between my thumb and index finger.