I've been doing this stuff for over 20 years. I use a coin and place a piece of Alcafor on it, light it and place the cup over it. It is amazing the relief of pain it brings me in places besides my back such as leg, arm, hip, and even my inner thigh once had an uncomfortable pain and I wondered...
you were beautiful when you started and now your just straight georgeous! Keep up the awsome work!!!!!!!!!!!!!