With its warm espresso finish, classic design, and wood construction, the Guidecraft Media Desk & Chair Set – Espresso is a beautiful addition to any room. How to Fix a Sinking Desk Chair. Office chairs use a pneumatic cylinder that controls the height of the chair through pressurized air. The cylinder on most chairs fails within a few years, typically because the seals are too damaged to Vineyard Executive Desk and Chair . If you have any customer service questions, order status inquiries, concerns regarding defective product, assembly of furniture or product operation, please call 1-877-858-8045 and ask for the Customer Service Department related to Costco. .