Seems like the stabber is for widening/cleaning the culprit hole and the fork is for pushing the worm in.
Why would you widen the hole?
I literally have no idea. I followed the instructions and just made the hole worse... facepalm Internal patch fixed it though.
@hippy started
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Seems like the stabber is for widening/cleaning the culprit hole and the fork is for pushing the worm in.