It also happened to me :( Did you solve it out?
As complained, the left bottom one was also annoying me, stripped out. If it is moderately stripped, then the rubber band would be the best answer as guided by andrewsimpsonx. The screw is tiny and shallow, so all you need is just one very hard pressing the screw, pinching the rubber band.
By the way, I was doing this to lighten my laptop, but note that it is not that affecting :(.