"Good, better, best; never let it rest, 'til the good is better and better best!"
"Providing quality service for the world's pianos" (When the world opens back up)
Join us: 63rd ANNUAL PTG CONVENTION & TECHNICAL INSTITUTEDoubletree Orlando at Seaworld
Aug 4-7, 2021
George W.R. "Bill" Davis, RPT, SERVP
The Piano Place GA
2315 Rocky Mountain Rd NE
Marietta GA 30066
Henry,I think you may have meant weld rather than solder. Soldering will not hold the tension, and welding will weaken the wire by heating it past its temper.
The thickness of the A0 core wire makes it tough to tie a knot on a good day with enough length. That's why a universal replacement or ordering a new string will probably work best.