I'm trying to practice using the mold tools on complicated parts made by 3D artists. The mold tools have been having trouble creating a parting plane and tool split on this model, and so I'm trying to follow a couple of youtube tutorials 

Part 1 (~3.5 min): https://www.youtube..../watch?v=2VbntVimKUkPart 2 (~5 min): https://www.youtube..../watch?v=pCXKPgZhuv4

I've been able to get the core and cavity