I wonder if you could just learn to love them as they are. Their sentimental value is due to the fact that they were worn by your father and uncle, so some people could appreciate them as heirlooms in their current condition, without trying to restore them. These were entry-level cases, and not meant to last forever, and the most skilled case restorers don't specialize in this type of work. They primarily work on stainless and gold cases. Regardless of cost, I think that trying to repair them is just going down a rabbit hole, where additional work could actually make things worse. Unfortunately you've already experienced that.
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