Where are you sourcing screws and other vintage lens parts?

[R_a_feldman]

For small imperial bolts and nuts (00-90, 0-80, 1-72), go to your local or online hobby shop and look for “Hob-bits”. When I removed the light meter and self timer from my Olympus Pen-FT, I needed to replace some bolts and it tuned out that 0-80 was needed, not metric.

 

[ajs]

UPDATE: Screw Size = M1.4 x 10mm
After much trial and error and a few orders from AliExpress (and the graciousness of @Calzone) I was able to determine the closest screw size to be M1.4x10mm. The thread was perfect but the length was a bit long; 9mm may have been best but that's not an option. Assembly images here Really could use a washer too but, oh well.

 

[PRJ]

For future reference, if the magnet doesn't work (brass for example) get some nylon stockings from your SO and double it up then place it over the wand of your vaccuum cleaner and affix it with a rubber band. That will work almost all the time.

You could probably still do that. The screw is around somewhere.