[Sol]

Columbo, your comment
"I have fitted a pair of Kadee no. 58 "scale" couplers to an 00 Lima Syphon. These are N gauge couplers in a No.5 draft box."

Kadee do not make N scale couplers , that is Micro-trains which was a part of the Kadee group until the split up.
The No 58's are in fact "scale" HO couplers.

Ron

 

[Sol]

Kadee make a large variety of couplers from HOn3 upto big G scale - ee their website

www.kadee.com

For N scale see WWW.micro-trains.com