*www.chennaichairs.com/chair-base
This site is offering chair base replacement as well. So if you find a chair with all required adjustment options but with a nylon base you can get it changed here.
Featherlite is also available in Chennai.
*www.featherlitefurniture.com/featherlite-chennai
Durian
*www.durian.in/product/define
Urban ladder
*www.urbanladder.com/study-chair?utm_source=mweb&utm_medium=mweb-banner&utm_campaign=banner4
They have a store at hafiz court as well.