I am working on three top end Dinosaur Bone Buck 110's for a collector who sent me two Buck knives with factory Damascus blades. I have not seen these 4 pin frames before and one was even more unusual in that the two pin holes were filled and two had threaded pins. In addition to the weird frames and threaded pins an adhesive was used that was like nothing I had seen before. IT was VERY tough to break loose even after heating the knife to the point I had to wear gloves to work with it. The adhesive wouldn't even dissolve in goof off - I had to pretty much use a pick and razor blades to get it off AFTER soaking in goof off. Have any of you seen anything like these from the factory before?