What ever happed to teh Sagar Makers Bottom Knocker?

a sagar is a box made of fireclay to put pottery in so that it doesn't get all tyhe bits from the coal drooping in to the clay - a kiln within a kiln about soapbax size (biggest) and a sagar kaer was the guy who........ and the bottom knocker was not the obvious - he just kade sure the base of the sagar was properly afixed. The lid was a loose fit.