rebuilding magnetic cassette seals

[Menachem Shoham]

We would like to rebuild our magnetic cassette seals for a Rigaku RU200
rotating anode generator. MSC charges $1400 for a new one. The problem
is Ferrofluidics and MSC will not sell the ferromagnetic fluid. Where
can we get the ferromagnetic fluid from? Alternatively, is anyone out
there rebuilding cassette seals for a reasonable price?
                                    Menachem Shoham
                                    Case Western Reserve Univeristy
                                    shoham at biochemistry.cwru.edu