Christopher Knight HomeMerel Mid Century Modern Fabric Club Chair, Dark Teal/Natural

I'm shopping for a 5' 2" elderly man. What is the measurement from seat to floor?

I received this chair but it came with only 3 washers for the legs instead of 4. How do I get another washer sent to me?

What is the length of the legs? Wanting to change them.

Can the cushion be removed?