You can use
black drywall screws for the outer shells if that's what you're talking about---the ones that hold the inner shells in place. I have never found a source for the bowl-shaped washers but I don't think you need them.
As for the bolts under the arm, just remove one and take it to a hardware store for a replacement. They are readily available.
Backings?
What do you mean?
There are a lot of small black screws that hold the inner shells in place inside the outer shells. You can use 1.25" drywall screws for these. They have no "backings" but they do have dish-shaped washers that fit into the holes in the outer shells. You can get away without using these, or just use one from underneath the seat or ottoman where they don't show.
If you mean the bolts, that hold the arm rest brackets onto the frame and that hold the back to the seat, they have nuts and washer on the inside. Again, standard issue.
The bolts that hold the top of the armrests to the armrest brackets screw into T-nuts in the armrests, also standard issue.
The screws
Here is a picture of one of the screws....I think they might be a washer. But not sure. Also trying to figure out how to take off the upholstery....I don't want to damage the bottom of the leather....I pull up on them and I can't see what the attachments look like to get them off safely. http://s1358.photobucket.com/user/Majick68/media/IMG_1640a_zps4d2389fd.j...
http://s1358.photobucket.com/user/Majick68/media/IMG_1640a_zps4d2389fd.j...
OK
Those screws are the things holding the cushions in.
Remove the screws. The seat and ottoman have screws on the sides AND on the bottom.
Gently pry the cushions out of the outer plywood shells. Sometimes they are stuck around the edges a bit; just run a butter knife under the welt (a.k.a. piping) to loosen.
The cushions consist of thin plywood shells that match the shape and curves of the outer plywood shells. These thin inner plywood shells have blocks of foam in them and the leather is wrapped around the foam and stapled to the inner plywood shell.
After the leather is stapled into place, staple the welt to the edge of the inner plywood shell and pop back into the frame. Replace the screws and you're done.
Welt
I was wondering about the welting. How that was applies. The Leather isn't to bad on the chair...but not pristine either. So just might keep it and refinish the wood. I'm just cleaned in soap and water all the cushions and they look a lot better. Just missing some buttons and the armrest need to be redone. But those look pretty easy on this chair.
What you're talking about is a
boxed style for the arms. This just refers to a cushion (attached or loose, but attached in this case) that has sides that are a separate strip from the top, forming a "box", sort of.
These are best done with an industrial sewing machine that sews leather and has a compound feed walking foot. You can do them with a home machine but it needs to be pretty powerful. You sound like you haven't done any upholstery before; I would recommend that you take the armrests to a professional if you want to add welt and boxing.
But in any case, the armrests on your chair don't wrap around to the inside so they're still not going to look much like an Eames chair even if you add welt and boxing.
The chair
Well I have done upholstery work before. Now with the cushions out it looks to be not that hard to do. Just need to get some nice Leather/welt. I like to go black...but the tan matches out Falcon chair. My current problem is finding just one glide that will match the others on the chair.
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