She told me how when she was a young girl the family tested her and her brothers to see whom would be able to help look for water for their farm, by using a willow twig shaped as a Y only her and one of her brothers gave any response when doing this type of dowsing, she also told me that she has tried different types of wood, and found that the young fresh cut off twig of a willow bush work the best for as a branch based dowsing tool, but she could do much more with metal rods, oh and that dry twigs do not work.
TJ has helped different villages, friends and family build wells with her dowsing ability, and I would not believed how well she could do this unless I had witness this myself. She even give the directions of the water under ground, if it's still, running, how much of it and how deep one would need to dig to reach it. Explaining that the rods are affected by the magnetic currents of the water, causing the willow rod to point down at water, and the metal rods cross or opens up in a W, it also work on other things, like finding people, or determine strong magnetic field in your home. TJ also told me that not everybody would be able to do dowsing, some seem to be totally unable to do so while others are born naturally talented.