Leica LTM Thread size of Leitz helicoid tube?

[L. M. Tu]

Hello, everybody. Can someone tell me the thread size and pitch of the female end of the helicoid tube on a Leitz Elmar 9cm F4 lens? The tube that the lens head screws into - I don't know what Leitz called it. I seem to remember the lens is from 1959; it takes a 34mm filter and has a small strip of fake black leather near the camera-side mount. I want to see if I can use this focusing tube with lenses in barrel. Thank you in advance for any information, and good shooting.

 

[a.noctilux]

Hello, I can't help on the dimensions you ask, but with a search I can suggest the type for your further informations.
May it be OUAGO/16467 ? but this is M mount:
https://www.l-camera-forum.com/leica-wiki.en/index.php/OUAGO
(in Leica Wiki ...) with more infos there .