Gene, I can see what you mean – did you use the same amount of iron powder, and are the iron pieces of equal size? I guess that you did, and that they are, but it does not hurt to ask, or I may look forward to another sleepless night
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Fearn's suggestion sounds like a good idea to try, I am looking forward to hear how the experiment runs.
You were very fast in getting the stone replaced - do you have a mine of your own?
Jens