placeholder\reminder - I hope to write a proper article at some point!
The fire plane - just come across this - another variation of friction method - not sure how it would work. i may experiment and post about it.
host spindles and socketed hand drills
lost of evidence that host and socketed hand drill spindles used all throughout world - see Walter Hough - Fire Making Apparatus in the United States National Museum for some examples
I may write a separate article one day