If, for rare reasons, the armrest of the Series 1 desk chair needs to be replaced, you can find the instructions in the form of a video here: https://steelcase.widen.net/view/video/g1uc8vt20c/16-0015222?x.share=true&x.portal_shortcode_generated=dykiwr9m&x.collection_sharename=znrcwkqb&x.app=portals