Larry Wolohon wrote:
"I thought that I heard that Sargent couplers will couple with scale Kadee
couplers such as #58, etc, which are what I have been using."

Whomever told you this is incorrect.  They are are NOT compatible with Kadee
couplers, scale or otherwise: 
http://www.sergentengineering.com/FAQCompatibility.htm 


Ben Hom