Don sez:

"Managing the puddle" is about impossible because it is so fluid, so it
must be
constrained with dams made of clay, ceramic jigging putty, casting
sand or ??? The trick is to keep the stuff captive while it's in molten
state. "

Notice here that by reference to "dams made of clay, etc", Don has offered a
gem of trivia to the loyal readers of RCM. Only someone with Don's vast
storehouse of knowledge re. "welding, soldering, sticking stuff together"
would know the oft-used expression "tinker's dam" refers to a soldering dam.

Bob Swinney