First, you have to find a replacement spoke.
Back in the olden days there were basically only 2 kinds of spokes: 14 gauge and 14/15/14 double butted. Bike shops carried both in a variety of sizes. Then came black spokes. Then the flood gates opened until there were a gazillion different varieties of spokes and bike shops stopped trying to stock them all.
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My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.