The following is a start to identifying LC Smith forend fastening systems...The Lewis system is sometimes referred the hourglass, banjo, or segmented wheel. I can find none of these terms in the patent specs, but all work well...The Wadsworth appears to be a Lewis segmented wheel with a further fastening improvement for withstanding heavy range use...there is a rod that runs clean through to the front of the full beav wood, as can be seen in the pics....the other two are the common spring type fastening systems that I can not tie to Smith, so for the moment I am calling them unknown type...There is also a drawing of the Curtis FE latch which looks very much like an Anson type..I once owned a Smith with a Curtis (Anson type) latch, and I once owned a Smith with a Deeley type FE latch (like a Parker)...there are probably others that I've not seen yet, but positively identifying 3, the Lewis, Wadsworth, and Curtis is a start..