23+ Gas Cylinder Chair US . Oem gas cylinder replacement for herman miller mirra chair (ship worldwide). The top part is called a gas spring and has a diameter of 28 mm or 1.1 inches. Amazon Com Big And Tall Gas Cylinder For Your Office Chair Furniture Decor from images-na.ssl-images-amazon.com But the swivel chair leg and the gas cylinder and the supprt beam with all the pumps to raise and lower the chair cannot be taken off. Your gas cylinder stroke is the distance your chair can move from its lowest position to its highest step 2. Replace your gas cylinder if it's faulty. A replacement cylinder—you can request a new one by contacting nbf's customer service at. I removed the mechanism from the seat and attempted to tap it. Oem gas cylinder replacement for herman miller mirra chair (ship worldwide). Firmly insert the gas spring into the socket on your office chair. If it'...