This is another one I'm having trouble understanding. Back when all we had for bowls was a hollowed out stump, how did we make decent hide/sinew glue? I know we used hot rocks but again, logistics. If you are moving hot rocks back and forth between the fire and the "pot" for 4-5 hours how do you keep the glue clean? How do you end up with any glue at all when you take a bit back to the fire on the cooled off rocks every trip? Has anyone ever tried this?