Hey Roo! Very informative! Thanks! I would like to also add one thing- Temperature plays a huge role in many pains that Leatherworkers experience. That is the Temperature of the damp Leather and cold marble or granet slab that we rest the heels of our hands on while tooling. I for one am VERY sensitive to this so what I do is have a small piece of thick cardboard that I rest my hand on... Never letting my heel come in contact with the tooling slab. Try it, you will feel much better after the project!