I never liked using a stir rod, I have a very large acetylene
welding torch and after the metal is melted I add flux and move the
arm of the centrifugal caster to release the pin, I jiggle the arm
and gently slosh the metal in the crucible and with the force of the
flame detritus is stuck to the side of the crucible by the flux and
I have done this for over 12 years and over a million sterling
castings. Although I do far smaller amounts of silver now, stirring
350 grams of sterling with rod was not fun.
Richard Hart G.G.