Printed Wiring Assemblies (PWAs)
Improper use of removal tool

The white arrows on the top of this hybrid circuit shows case damage as a result of improper use of a removal tool.

Reference :
NASA-STD-8739.3 6.6 Conductor Preparation Tools
3. Holding Devices. Tools, fixtures, and materials used to hold or restrain conductors and parts shall be of a design that will not damage or deform the conductors, conductor insulation, or parts.