A 1966 73 Magazine Article on a Homebrew Permeability Tuned Oscillator (PTO)

In April 1966, Lewis Fitch W4VRV of Columbus, Ohio built a Permeability Tuned Oscillator.  It is remarkably similar to the devices we are building today.  

Lewis opened his article with this: 

Clearly, this guy was one of us! 

His article is filled with good practical advice on VFO construction, with a special focus on PTOs.  I was intrigued by the way his PTO mechanism allowed for the use of a reduction drive.  This would help us avoid the indignity of attaching a digital frequency counter to such a quintessentially analog device.   

Check it out: 
https://worldradiohistory.com/Archive-DX/73-magazine/73-magazine-1966/73-magazine-04-april-1966.pdf

Page 30.  

Thanks to Michael (VE2BVW ?) for suggesting that I dig up some old 73 Magazine articles on PTOs.  A quick search revealed that there weren't many.  If anyone out there knows of good PTO articles in the ham or EE literature, please let me know.