Technology & Equipment
Unnecessary holes were bored in the case.
The holes are eliminated. Milling and anodic treatment removed the traces.
To eliminate the holes prepare the edges first.
Close the holes by metal disks ( 1 mm thickness here).
Fill the closed holes by spraying K-20-11 to both sides.
There were several cases with the excessive holes. The second hole was missed at this one. The first hole is already closed and milled.