The allen bolt is so small, not even Sears Craftsman tools make a small enough size. I went there and bought their smallest (~$2) in an effort to get my keyboard working again after a beer spill. It's still about one size too big. I gave up on disassembly. I've done two dishwasher cycles, and with each I get more keys back. I'm down to just one or two inoperable keys from a post-beer high (pun intended) of 10 or 12. Matthew