whats the correct way to reassemble the backwards slash key?

@genesis66355 there are a few different key mechanisms around . You will have to determine which one suits your keyboard. Check on which ones you have, by comparing to this site

Now, to replace the keys is a bit trickier and since iFixit does not yet have a guide for that, try something like this video and many others on YT

While you work on your key caps, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has the same problem as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.

Repair is War on Entropy