I seem to remember, somewhere coming across a post giving the source of the brush that is available from ammonyc: http://www.ammonyc.com/product-category/tools/ The "big wheel brush and small interior brush". Does anyone know a supplying source for these?
I had one from adams which fell apart so I look around, I got 3 for just a little more than what 1 would cost from adams and they have better exopy and hold up great.