I took apart my Korg DSS-1 a few years ago to install a floppy USB drive (succesfully), and a couple of the long screws on the side of the keyboard were stripped. I ended up getting them out with a little trial and error, but have misplaced them and don’t have the part number.
In my experience disassembling, they were by far the longest screws and quite thin.
Does anyone have any idea what the screw size is? Sorry for the vagueness. I Googled it a bit, but my Google Fu has failed so far. I could take some pics of the side if that would help.