Am I justified in my frustration?

go-fish said

Again, it begs the question, is a seller responsible for validating a part IS good before claiming its good?

That was the impetus of this thread.

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It seems to me, YOUR idea of "rebuildable core" is one you can use as-is without a full rebuild. A rebuildable core is exactly what you bought, and received. Whether or not YOU have the skill to rebuild it is irrelevant. 2c