Gary,
I just wanted to say thanks for your post. I know you said you got it from a different forum, but this is the one I read. Picked up one of the pool floats from Wal-Mart and cut some sections to fit under the seat on my 4400. Incredible difference!!!! I spent several hours on the tractor today, and it was the least tiring time I've spent in the seat. The biggest difference for me (I'm 6'6" tall) was that my legs weren't cramped up all the time as the seat never compressed and allowed me to keep my legs stretched out. Again, thanks for the post and if anyone has any doubts, this idea REALLY WORKS.
Hoss