For a 5 inch bowl check out any place that sells stainless cooking
ware. they have bowls in assorted shapes and sizes. Even Harbor
Fright sells them in sets.
For turntable and other interesting hardware go to Lee Valley they
not only have an amazing selection of tools and supplies. But have a
large assortment of hardware and drawer slides ect. The have a whole
line of turntables from small light weight ones to heavy duty
multiple hundred pounder units.
Silcon carbide blast medium will work comes in a 50 pound bag for
about $75.00 US. you can check out your local suppliers or Eastwood
You also can use pumice sold by most place that deal in jewelry
tools as annealing pan filler. You can get it in different grades of
coarseness. They also sell emery grains like on the emery paper. It
could be aluminum oxide or carborundum. The aluminum oxide is also
sold as blast media. You can get lava stone from the garden store or
your landscape. put it between two layers of blanket and with a
hammer make it smaller. Even dried sand will work as annealing,
soldering media as long as you don't heat the sand up with constant
Your choices are just about personal likes or what you have on hand
or what you can easily buy. just make sure if you bring in from
outside any media that it is throughly dry before use as to
eliminate the small steam popping if it is wet or damp.
As to the turntable mount to either a bowl or tile any type of
caulking will work.
In catalogs they may be reffered to as Lazy Susan's/turntables
been there done that !