CRK clips have a smaller hole that only fit on some of the models with the slightly smaller head screw. To mod your knife to fit get a file and a drill and put the threads in the drill and file or sand a very small amount off till it fits. Replacement screws from CRK are cheap if you ever go to sell down the road.
Copper scales, some are almost perfect, Others have slight machining defects and or the drill walked when drilling the holes. All were test fit and function fine.