When I first learned about packing front wheel bearings, I asked about the full-up hollow area in the hub. I was told that people think of it as extra grease that can flow into the bearings if they get real hot. Well, it seems to me that if the wheel bearings get real hot, there's a problem with the packing job or some damn thing making the bearings hot. Look into the heat problem. I just pack the bearings themselves (using the palm of the hand method) and reassemble. Never had a problem. I've been a mechanic for decades.
