TSC Takeshita-san,
I have received the email. Thank you very much.
All the evidences given from manufacturing quality shows positive result this time.
So to be honest, we are facing difficulty to understand this case hair crack why happen.
Now I am coming up with a worry about design robustness. Can you please discuss with Hilex Japan for this point and re study CAE analysis strain level around the hole when screwing with the maximum incline condition etc.