Not Unique But For Me A Complication !

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Ladies Ebel, dearly beloved has been nipping my ears for a while to fit a new cell to her treasured Ebel.
Now I know it's a front loader, and that's my complication. These perfect screws surrounding the crystal, I am reasonably competent but they are my first concern.
Anyone carried out a replacement before and can give some advice ?
Iphone is good but not good enough this evening 😬
file-138.jpg
 
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Job done, piece of cake. Screws not over tight, split stem, one of these once you've done it once jobs it's easy.