okay fedi I cleaned my keyboard and I can't get the Tab key back on properly. I'm pretty sure that metal bit belongs to it, but I have no idea how it attaches! Anyone got a clue? The disassembly/reassembly videos I've found skip over this particular key.
(The other keys that size snap on to the switch without a metal bit, but this one doesn't, which makes me think either a) it needs the metal bit or b) something broke. The switch seems to work normally, though.)
Model is the ThinkPad USB keyboard with trackpoint, KU-1255.