Replace the tape with magnets to hold the display like older models
Well as the tittle says if you have plans to upgrade your iMac slim edge or just like to tinker with it and want to have easy access to its internals it is possible to use magnets and have it like the older models.
All you need is some neodymium magnets - I used about 6 or 8 size 20mm/10mm/2mm - a strong 2 sided tape and a rigid plastic card (can be expired credit card, unused rewards card, whatever as long as it is plastic and rigid).
Oh and this grey styrofoam-like thing I don't know what's called.
Here we go assuming you already went through the display removal process in this guide:
-Get the strongest 2 sided tape you can find. I used this one:
-Attach the magnets on top of the case which is the only part of the display with metal (picture shows 6 but I think I added 2 more later on):
-Cut the plastic card in 2 halves and attach at the bottom of the display:
Then there will be a gap between the card and the case which you don't want to fill with something rigid that will prevent some wiggling necessary to open/close the thing neither will it be a good idea to use something too soft or it will get loose and you will want a tight fit.
I used a 3mm height/5mm wide strip of this grey foam attached with a thin 2 sided tape along the plastic card and it worked exactly as I needed - but your mileage may vary depending on the material you use.
And that's it! Now you'll be able to open and close the computer using suction cups like the old 2009-2011 models :D