Ring-a-ding crankshaft

[cardiffrob]

Would any kind soul be able to post a brief video that demonstrates the sort of sound one might find trying to make a crankshaft ring after being hit?  Not exactly NDT Science but I have several old cranks here and I noticed they all sound the same with neither a Crystal Wineglass ring nor a dull thud.  All cracked or all good?  Dinggggg, Dangg or Donk?  I have an excess of old blocks and crankcases that I need to sort through and am not sure if anything is really worth hanging onto.

Thanks.

Rob