I also really like the Optimus Nova stove. I had gone thru 2 in about a year. Both broke at the base of the Burner Unit
http://www.optimusstoves.com/fileadm..._schematic.pdf
the whole of the design funnels down and focuses itself at a central "Burner Nut" part# 8018
the mating pice to that nut is the burner assembly "Burner Nova" part# 8402
both stoves broke at the threads
I admit, that in those days, I really loved this stove, and I burned it a lot
I used it like an appliance
I was living out of doors a bunch
and it was my stove... I used it a lot. a lot of sitting around reading a book and making tea, etc...
I broke 2 of them
then changes to a Snow Peak White Gas
which is very much like the WhisperLite