

I just got this old padlock, it's full of sand, grit and oil. I picked it after loosening a stuck wafer, it was not difficult but now there's black and sticky sand everywhere.
I'd like to clean the inside, picking it felt like sanding the pick. I think it's possible to disassemble it since there's a screw in the bottom of the shackle hole. I sprayed some penetrating oil and unscrewed it. Nothing happens... any idea on how to remove the core? Should I close the shackle? Look for a retaining wafer?
Thanks
