How to reattach the space key

Same issue. Extremely disappointed with Apple because you very likely won't be able to fix this if the small arms that grip the key in place is broken. You will need to replace the entire keyboard or lower case housing; in the middle of figuring this out for myself as we speak. Although Apple says they have a replacement plan for the faulty keyboard, they consider this as "damage" and disqualifies it from the replacement program. Mine literally popped off when I took it out of my laptop bag and they denied the repair. So lame.