Copy of the only solution I found somewhere in a forum:
cabinetdeluxe - 22 Nov 2018
#2 "I copied and pasted these instructions into a word doc years ago and sadly didn't record where they came from. I hope they'll be useful to someone else as they were to me. I make no claim to own the excellent work of the author. Sorry not to be able to acknowledge you fully, whoever you are. It may even have been another thread on this forum but i've searched and can't find it, so here goes...
"Maralunga Three Seater Sofa Reupholstery: this was an old post/request from 2005 but I have the same issue right now and thought I'd post what I discover here for anyone else in need.
I called Cassina and asked for technical details. They were very helpful and said they would see what they could find out for me. No reply yet so I'm trying to work it out.
I've carefully explored all parts of the sofa and can feel there are slide-and-lock mechanisms with grommets in the arm/end pieces. Thing is, they move in different directions for the seat and for the back, so you can't just slide and heft the arms/ends off the sofa. You have to be strategic. First, uncouple the seat from the back...
The seat uncouples from the back via two Hex-head screws in the bottom rung of the back. Turn the sofa full upside down on an upholstery table or trestle table with the seat flat on the table and the arms and back hanging over the edges so they are not carrying any weight. Press your fingers into the foam and fabric along the bottom rung of the seat back. You'll find two round, hard shapes, each about one third in from the sides, in line with the seat braces that run from front to back under the seat. There are tiny holes in the fabric above each shape. Get a hex head or allan key - I had to experiment with a wide range of sizes to find the right one.
Loosen these screws off - if you go all the way one way and can't turn anymore, you've retightened the screw. Move them back to a position where they're free-moving and loose when turned in either direction. This uncouples the seat back from the seat panel and you may hear a dull 'thunk' as they drop apart a little.
Now unscrew the foot panels from the end/arm pieces and put these aside. You'll find two exposed tube ends and a hex-head steel screw close to the front foot of the sofa. With the same hex key, remove this screw and put aside.
Now put your weight on the arm/end piece and push it down so that the base of the arm and the base of the back are level. It takes a bit of wiggling and thumping but you should find the slide-and-lock mechanism closest to the foot of the arm/end piece loosens and you can pull the arm away from the sofa back at the meeting point between the base of the sofa back and the base of the arm.
There is another grommet away from the foot of the arm and this one you need to push the back towards to the front of the sofa to loosen. It should click out pretty easily if you apply nice even pressure to the sofa back.
At this point, if you've successfully loosened those central screws in the bottom of the sofa back, the back of the sofa should also come away from the seat panel. Take care not to allow the back to just slip off the table as it may bend the slide-and-lock plate on the other arm to which it is still attached. I used a large clamp to prevent the back falling away from the seat.
The arm/end piece will still be attached to front of the seat panel. For this slide-and-lock mechanism you must push the seat panel back from the front of the sofa (or the arm towards the front of the sofa, whichever is easiest depending on the position you've got the sofa laying in)."
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