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I have taken up this rather odd endeavor of re threading the case-back and mid-case of my 1960’s Rolex. This is not a well-documented topic so I will be posting more information and updates as I go along. Rolex threads are 60-degree metric profile with 0.5mm pitch. Since both parts are being re threaded, as long as the pair is threaded correctly it will work. (Metric or imperial) There is a lot of thread cutting theory required which will be discussed later. A threading calculator will be helpful then. There is one documented repair like this HERE. Pictures are quite helpful. Since I am doing it for the first time, this is also a call for help with questions in the end. The parts with pitting: Both mid case and case back has 4-5 patches of varying sizes like these. (steel after the seam is the opening tool and not to be confused with an additional step) Pitting runs deep even after filing off the threads. Pictures of thread dimensions: Consider the fact that both threads are worn and damaged from multiple places so these are approximate. Questions and help: For deep pitting, the plan is to get diamond burrs and remove material and fill since that is the only way to get rid of pitting, better ideas appreciated. There is some talk on Rolexforums about 304 Steel in 60’s should I be getting that welded since my piece is from that era? https://www.rolexforums.com/showthread.php?t=643301 Any laser welders out there who have practical experience of using different shielding gases and materials please hit me up. Suggestions appreciated. Thank you!