Howdy Pettigogger,
Thank you for the link to "Winchester Toggle Link 101". You did an excellent job on this tutorial. I downloaded and printed it for future reference. The pictures and the narrative make it easy to understand how the everything ties in. The explanation of the built in case gauge is what I was looking for. I should be OK with an OAL of 1.575".
By the way, the Winchester Model 1873 is a great addition to this Forum, very informative and helpful!