Maximat and Minimat matting brushes

Hi, I would like to ask if anyone has used the Hatho Maximat and
Minimat matting brushes. I have used the yellow one and really the
satin finish it gives to metal surfaces is unique. I bought mines from
Rio Grande but due to use (and abuse) many of the wires have broken
and now I would like to refill the brush. I know this is possible and
would also like to know if anyone knows a place where I can find the
wire refills in the USA, and also would like to buy the Minimat to use
it in my Foredoms.

By the way I have been using the Harbor Freight dual barrel for many
years and once and then I just clean it and check the belt and I am
really satisfied with this economic tumbler.

Thor Hedderich