Umbrella Holder for Camp Chair

I usually use camp chair for sketch out door. Some time, i find out a good position for sketch but it's so hot because of sunny. You know, there is more than 6 months of sunny in Ho Chi Minh city, Viet Nam. So, I need an umbrella. I made this umbrella holder for my camp chair can easy change the height: from 60 cm - 160 cm and easy to pack. I can also hang a bag (the white bag in image below) on the holder.

Components:
- Camp chair
- 2 tube of water 50 cm and 60 cm long (1 have diameter bigger than another)
- 1 umbrella
- 1 bolt around 10 cm.
- 1 string of electric

The images above show order of how to make it, step by step. Do not hesitate to ask if you do not under stand anything.

Enjoy your day. :)