Thanks Don. I didn't realize that link didn't work. Though it was the link given by YouTube. So thanks for sharing the correct one.
And yes thanks I had to really stress myself out over this. Finally found 2 warehouses in Delhi that keep and sell airbrush spares and accessories. Though they are all Tattoo stores but I found the spares.
The airbrush has been working well since then. I have already completed my first project with it. Though not entirely airbrushed, but learning along the way.