Frameless Keyboard key/button came off how to fix it back in

To be honest, when someone brings me their KeyBoard with a key that has come off i actually slowly and carefully take another key off their KB, to see how that one went on there, and by the powers of deduction i put both back on the same way, some might not suggest doing this but it IS something you can try, i have done this plenty and usually it goes back on the KB in a completely different way than i thought thats why i remove one before attempting, or at least raise one up enough so u can see under it to see how it is positioned blah blah blah...