Sweet E-bay Find: Nikon AI Conversion Ring Content, 24mm

I had been looking for a AI conversion ring for my nice 24mm 2.8 Nikkor K style. I greased the rear helicoid here ( https://www.photrio.com/forum/threa...i-fixing-an-awful-squeal.212635/#post-2880270 ).

I found some AI conversion rings that were listed as "unknown." I was looking for #22. By reviewing the pictures, I chose one that looked to be correct for my lens and took a chance on it. Turns out it fit perfectly!

I found another that looked like #73 for my 80-200 zoom. I have yet to see if that one fits, but it looks promising.