Jimmie,
Let's wait to hear from Denny. The coir(-like?) material was discussed in a thread where Denny showed photos of his upholstery work.
As far as I am concerned, Jim Carter's installation kit is inadequate (and tough to sit on, even with a non-boney butt) because he does not include the coir-like material. I also followed his instructions but will not do so in the future.
