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I recently purchased this nice 4005A Bell. Seller picture.



Now I fitted a replacement Sternkreuz XAG326.533 crystal the original crystal did not have a tension ring and was cracked. With the new crystal in place and the case back spring fitted the alarm ring is impossible to turn. With the case spring removed the alarm ring turns and there is not really that much play.

My question is are some AM case springs thicker than originals or is the Sternkreuz crystal the culprit here???

Thanks in advance.
 

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I've had that problem with SK crystals (albeit only with 4006 models), so that is what I'd suspect first. Perhaps see if you can't source a genuine crystal.
 
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