Research on disc finishing

I am doing research and testing with disc finishers to add detail to
my book on mass finishing. If any of the wonderful Orchid community
could help me with your experiences, biases, questions and more on
the subject of disc and drag finishing, I would be most

If any of you know of disc finishers under $900, other than OTEC,
please let me know.

Many thanks,
Judy Hoch, G.G.