Weighting upright keys question

[KeyKat88 at aol.com]

Greetings,
 
     In general, is installing weights in upright keys a corrective remedy? 
If so, is to correct due to wear problems or to improve upon original factory 
specs?  Can a piano need weights new from factory? What do weights in an 
upright corrrect? Any suggested reading on this would be helpful.
 
Thanks
Julia Gottshall
Reading, PA 



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