You may not be able to make this stove out in the field with a pocket knife but it could come in handy in a grid down situation or used as an inexpensive camp stove in you backpack.
http://survival.outdoorlife.com/blogs/survivalist/2014/02/how-make-quick-can-stove
This is a companion discussion topic for the original entry at https://peakprosperity.com/how-to-make-a-quick-can-stove/