Ignoramus16228 wrote:
(snip)
Ringing and rebound are very similar physical properties, they are a
manifestation of how little energy is absorbed by anvil, as opposed to
being returned to work. So a "good" anvil keeps ringing for a long
time after being struck, which is utterly useless, but is a good sign
of anvil's other abilities to return energy back to work.

Anyone has a good suggestion to reduce ringing? Stick a rag into the
hardie hole? Put a female tit on the heel?

The lead sheet is a good suggestion. Also, try a large magnet on the
underside of the heel.