Ah... the experimental aspect was the Micarta back spacer. Micarta just doesn't have the stiffness that G10 has. G10 is fiberglass fully saturated with resin... and is fully plasticized whereas Micarta uses natural fibers and a thermoset resin that never fully saturates all of the fibers. Because it doesn't fully plasticize... it doesn't have as great a structural stiffness. The Spyderco knives using FRN molded back spacers... Delica being one of them... have the same stiffness issue. With the back spacer there are two protruding molded nubs on the lower tang. These nubs index with holes in the stainless liners to capture that lower tang and provide the solid resistance the spring bar requires to store and deliver the bending energy for the back lock bar. My machined G10 back spacers ARE stiff enough to not require the indexing nubs... BUT our forum brother desired a Micarta back spacer. Never employing the weaker Micarta as a back spacer material for these knives... I reluctantly machined one and cobbed up an inelegant solution for lower tang nubs. I made the caveat that this was totally experimental. I've since gone back and did some redesign to the back spacer and I hope to soon machine this in Micarta. It's all about the nubs and the necessity to capture solidly that lower tang. Spyderco's molding solution is perfectly simple. My machining solution uses two separate parts. Attempting to machine a monolithic piece would be prohibitive for materials and time. I'll know more once I can get the MKII version machined and out in service.