Hi Dave,
the kits I have used are fine. It isn't perfectly straightforward as the centering is critical otherwise the coils will rub and sound horrible and eventually wear out. If you decide to go down the refoaming route then drop me a PM and I'll advise you if needs be.
Jandyt did an excellent step by step thread in the workbench section here on refoaming some S120's.
Chris
The use of metaphors should be avoided like the plague. They're like a red rag to a bull to me.