Not sure why you need an awl for shared holes on the Head, though it comes in handy sometimes. I have not strung these Head Graphene, yet, but most of the time the holes are large enough to squeeze a second string through, like a tie off hole.
I recall there were a couple of Prince TT rackets that had shared holes but they had something like a double barreled grommet.
Rabbit, I guess you had to start over on 4 rackets?
Machines: Gamma 6004 2-point w/ Wise 2086 & Babolat Sensor Dual