Investigation: used test and analysis equipment; keyence-vhx 600 d microscope; (b)(4) digital camera.We made a visual inspection of the spring segments of the upper disc and the pin at the lower disc.Here we found, that the pin was cut skewed.Next we investigated the upper disc.We found that some of the spring segments were bent.Finally, we investigated the pin leaving.Again we found a skewed cutting edge and a damaged fixation rim.Batch history review: the manufacturing documents have been checked and found to be according to specification valid during the time of production.Conclusion and root cause: the root cause for the problem is most probably user related.Rational: some of the spring segments are bent, this is a clear hint for a handling error (upper disc applied slanted/handling with wrong instruments, etc).No capa is nesessary.
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