>The acid flux did the trick.

What he said.  Use regular solder with acid flux (aka "tinner's fluid").
Works on stainless steel, too.

A big problem with using silver solder on piano wire is that 
it requires a torch.  The solder may be strong, but the high heat 
turns the hard piano wire into soft annealed mush.  This often 
defeats the purpose of the strong solder.  A soldering iron is 
cool enough so the piano wire is unaffected.  

If the solder joint needs strength, there are often tricks 
to get that.  Increase the solder area, or wrap the joint 
with fine wire before soldering.


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