[Elecraft] IF output buffer gain Mod

[DBellW6AQ at aol.com]

So I see how to attach it but have no idea what a "via" is?  I  built a KX 
1 without ever running into a "via" I think.  And if you can see  the "via" 
used to anchor one lead of the resistor in the photograph that is  in the 
instructions you have either better eyes or a better imagination than I  do.  
Apparently the "via" is the little plastic thing in the envelope  with the 
resistor, but what is it for?
 
And for that matter, what is the purpose of this  modification?  10db more 
signal level at the IF output gets me what  exactly?  I could use a little 
more gain in my Heil BM-10 headphones, but  is this going to get that for me 
without distortion?
 
1,000 pardons if this has already been beaten to death on the  reflector.
 
73, Dave