You need to buy and undo 2 kerfus's for 5 kerfus parts, 2 plastic scrap , 1 metal scrap, 1 rubber scrap, 1 or 2 electronical scrap and the fishing parts.
The Omega Kerfus manual demands fishing parts to craft them. I don't know if they changed the crafting recipe but mine specifically calls for the fishing parts.
my omega kerfus didnt need any fishing parts and to get the parts back you can dismantle it by placing it on the workbench and interacting with the bench
