Studio Arcanis

I am very adept at using a pendulum. Much more than a crystal or dark mirror although I practice with these daily. The pendulum is super responsive to me and I have used it very successfully to find oil, a couple of hidden coin caches, a lost mine, of course water and a few other things. I can map dowse with a pendulum like nobody's business and accurate too. But my love is High Magick so it brings me to this. I was wondering if any of you have ideas about envoking a spirit into a pendulum or using a pendulum for spirit contact? Could anyone suggest a text or methodology? I have not attepted to do this for the sake of safety until I can get further instructions from you, my learned brethren.