Cam/Crank TDC mark

Just installed back to OEM cams and im having trouble getting the Cam tdc mark aligned.
Does the mark have to be parallel is there a proper way of doing it.

Ive been seaching all over online from just eyeballing it, haynes manual, put a 5.0mm punch but cant seem to get it right.
This is for a b18b1

Any help appreciated.