We saw this firepot and the cast iron "Cheeks" for sale in the vendor area outside the Helfstyn Castle (Czech Republic) during our 1999 ABANA tour.
I am still kicking myself for not buying one at the time. The cost of the firepot assembly was about $150 USD at the time
and they told us it would cost another $150 USD to get it shipped to the USA.
I should have taken pictures, but I did not. Later in the tour, we visited some shops that used these setups and I have
a few pictures that show portions of the system. That circular clinker breaker seemed to break up the clinker into dust,
which was easily removeable by opening the gate.