This article includes a 3:24 video walkthrough.
Quick answer
Bought your Anthros without arms? Adding them only takes the 4mm Allen tool. Remove the seat cushion, pop out the decorative caps, hook each arm into place, bolt it down with the included bolt, and reinstall the cushion.
Step by step
Lay the chair on its back. Remove the two bolts under the front of the seat, lift the cushion slightly, and pull it toward you to take it off.
Use the Allen tool to push on the clips holding each decorative cap, and the caps fall out.
Raise and fully extend an arm, then hook its "fingers" up into the opening.
Drop the included bolt into the hole and thread it in with the Allen tool. Once it catches, you can let go and tighten it fully. Repeat on the other side.
Reinstall the cushion: set it about an inch forward of the back, press down to catch the four hooks, push it forward, line up the brass holes, and replace the two bolts.
Also called: armrests, adding arms, installing arms, chair without arms, arm kit.
Video transcript
So you bought your Anthros chair without arms, and you'd like to add them on. Well, guess what? It's a piece of cake. All you need is your four-millimeter Allen tool. Take your chair, flip it on its back, and underneath here there are two bolts, one right here and one right here. I took those out already. You just go in and take them out. Here's one, here's two, and then your cushion comes off. You just lift up a little bit and pull it towards you. There you go. The cushion comes off.
Now, you've got your arms, and they hook into here, but there's a decorative cap that's in the way. What I use is the Allen tool that you just used to take the cushion off. There's a clip here and here, and I just push on that clip with the Allen tool, and watch. That falls out. That one falls out, and now your arms are ready to go on. They just hook in.
I think it's easier if you pull this up and extend them all the way. Then I come in back here, and you see these fingers? They go up into there. Look at this. They just curl in, and then you use the bolt that we ship you. You put it down in here, right there. Use the same tool again, and you just thread it down and in. Once it catches, it'll stay. You can let go, and you just turn it. Get it nice and tight. There you go, that arm is on already. That's how easy it is.
Same thing on the other side. Extend it up. Bring it over here. Hook it in underneath. Get the fingers in there. Hold it up into place, put this bolt down into that hole, and use your tool to get it started. Once it's started, you can let go and finish turning it in. There you go. Nice and tight. Your arms are installed.
Now we put the cushion back on. I think it's easiest to do with the chair on its back. I'm going to grab the cushion, and there are four clips. I want you to see them. Here's one, here's another, and here are two more. Those go into here on the cushion, and you need to get those in place. The easiest way to do it is to get the cushion about an inch from the back and put a little pressure downward, and it catches those hooks. I can tell they're caught because it's nice and flush here and here. And then you just push the cushion forward. Make sure it's down. Can you see the little brass holes? Are they lined up? Put these two bolts back in, tighten it up, and you're all done.