Repairing a Focal MC Auto 28mm F2.8 lens with blurry corners. (Image quality)

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Repairing a Focal MC Auto 28mm F2.8 lens with blurry corners. (Someone else's mess)
Here is a K-mart house brand, Focal MC Auto 28mm F2.8 lens (m42) that someone has tampered with. It has multiple evidence that someone not knowledgeable has disassembled the lens. In this video, we go through the steps to fix it without any information.
EDIT: In the video the lens is described as 8 element in 7 groups. However, this might be a mistake. The lens could be 7 elements in 7 groups. The doublet may not be a doublet, but a single element.
FR EP34
Music :
No.3 Morning Folk Song
&
No.7 Alone With My Thoughts
By :
Esther Abrami

[@tomhills1690]

Thanks for sharing. I had an exact copy, and had the same problem. I found the factory assembly work also reserved #5 and #6.

[@bradleyhayman2682]

thanks so much for this video! figuring out the correct order of all the elements is my worst nightmare but this really helped

[@ЭтоДрючинский]

I actually find it an interesting artistic feature, not a mess only)

[@htb123times]

It would mean the world to me if you could show how to open up a vivitar 20mm lol I can’t find ANYTHING about this lens and I need to get into it 🤦🏽‍♂️

[@FocalReduced]

If I receive the lens, I will sure make a video of it. Thanks for watching.