Frank, it was not ground out much at all, as it wasn't leaking, and nothing structural appeared to be abnormal. Although it was not me personally that held the grinder, it was on me to see it done. So I told the man to just cut it out good, don't spend all day on it, and we have these rolls of glass in the shop that is neat. I don't remember the name of it right offhand, but it comes in rolls of course, about 6 inches wide, and has woven roving on one side, and a tight cross cloth on the other. Wonderful stuff, we use it a lot. You do not have to alternate different glass types with this stuff, just wet it, and stick it.
Like I said, I remember clearly inspecting the thing, but the repair details are not as clear in my mind, simply because it was just a patch more or less, three, four layers, whiz-bang..
