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I think we've all done that - been absolutely sure that [mysterious item] is part of something else, or is something else... and have been insistent about it... only to find some sort of evidence later that we were wrong. It's only then that the confirmatory droplets of memory start to trickle in.
And from personal experience - the older you get the worse it gets!!! 
And the final chapter!
It's not from an old grinder, it's from the one that's sitting right there in their kitchen! 
They see it hundreds of times per day! But they story is they have never used that container - have always just kept in in the cupboard and somehow came to believe it was part of their juicer. Thank heavens for astute forum members.
