# data[].attributes.headline
First step is mark out grid lines with the sheet instructions 

# data[].attributes.subject
First step is mark out grid lines with the sheet instructions 

# data[].attributes.headline
After marking out the grid lines drill with 40mm drill

# data[].attributes.subject
After marking out the grid lines drill with 40mm drill

# data[].attributes.headline
After the process of de burring and drilling though

# data[].attributes.subject
After the process of de burring and drilling though