Yeah Dave, just knock the roll pin out of your original blade, and the same with the copy blade, and fit the black plastic part that is currently fitted to the copy blade to your original blade, using your original blade's roll pin.
Then the assembled blade and plastic part can be simply pushed into it's fitted position, in the replacement case.
Make sure you transfer the PCF7930AS from the original key back into that of the copy casing, and not just the PCB.
Job done
Brian
