This is the interior of the knee showing the surface of the chainplate AFTER grinding out most of the interior layer of the fiberglass (about 1/2" thick fiberglass). The knee is a sandwich -- fiberglass-stainless chainplate root-- stainless. I have ground out one of the layers of the fiberglass "bread" and need to release the stainless chainplate root from the remaining slice of fiberglass "bread."
https://plus.google.com/photos/10015...41200786?hl=en
Hope this works!
---Karl