Sounds like you need to purify and consecrate it: purify by water, consecrate by fire. Here is a very effective way, if you have my flair for the dramatic and the integration of Science into your Magick.
Take some hot but not boiling distilled water, and charge it with purifying energy. Place a single crystal of rock salt* in your hands. It can optionally be a little bit of salt of any kind. The key is salt is a naturally occuring cube in crystalline form. It is a type of earth, as the hot water in the cup is a type of air - for air is "warm" and "wet."
How you hold your hands is a key as well. You hold the left hand palm up and fingers facing right should be holding the single rock salt crystal, generally at the level of the solar plexus. Right hand palm down on top, fingers facing left. It forms a right triangle, with your head as the pinnacle. The Right Triangle is a great emblem of power, when resting on the "hypotenuse." Hypotenuse means "I arch over you." It's root is feminine, and emblematic of the infinite nature of the Goddess. This is drawing down the Goddess "Rhea" to the salt crystal.
Let solar energy of the Father of Life fill the rock salt crystal.
Drop the salt crystal in the water. It will dissolve and the heat in the water will subside. When it cools, it is ready. Cool and Wet is Elemental Water, formed of Earth and Air. This is now emblematic of "the waters of life" and tonal and radio frequency ionization will actually cause it to combust into fire if the salt and water ratio are correct. Those ratios are expressed in the Right Triangle's relation to the Hypotenuse. This is the basis of Greek Fire, a liquid fire weapon used historically. It is also the answer to spontaneous human combustion. Occasionally someone actually "re-discovers" this, but it is swept under the rug.
Dip the stone three times in the Waters of Life (distilled salienated water), and each time say "I purify thee [name of pendulum] by Water, of all use and purpose but to the service of The Art and Science of the Wise."
Burn some styrax, frankincense, and myrrh on a charcoal burner. Try to find a place to hold the censor at heart level. and cleanse in the smoke, not the heat (that will crack it). As you consecrate it, by Holding it above the smoke in your arm outstretched at a 45 degree angle, dip the stone all the way down to the level of the coals BUT NOT IN THEM, just deep in the smoke. As you do this, each time say "I consecrate thee [name of pendulum] to the service of the Art and Science of the Wise."
Keep in a silk pouch, itself wrapped in a small bit of wool cloth (preferable not dyed). Suspend from a silk cord for best consistent effect. Wash arms to the elbows and face before use.
The "Pendulum", properly entered the service of the Art and the Science of the Wise by way of Galileo Galilei. A proper pendulum, by tradition should be "heard" as a middle "C" sub-audibly, and in operation can be heard to shift tone and octave as it is used to confirm inquiry. This began in the 1600's and employed a piece of gold, not crystal. Gold is optimal, for it's density means there is more weight, and it's conductivity is as great as a metal can be. Mostly, a single coin in a pouch was used, offering to give it to the spirit, by smelting it down and making a disk with "their seal" on it. This was not long before professional pendulums by jewelers were made. Later, crystal pendulums were mostly used when they had gold housings.
This came after Newton's optics showed the light refracted through a crystal prism displays perfection of the spectrum. Prisms became popular because of light refraction which sometimes revealed more than the acasual swinging. Evidence that Newton used a crystallized Iron pendulum was proposed by R.A. Schwaller DeLubicz, one of the greatest chemical philosophers and archeologists of his time, or any of record. This man did alchemy "modern" science still can't synthesize, he has a chandelier in his estate made of crystallize precious metals... from things he learned in Egypt.
There was also two people using these, as the person employing it was often blindfolded, while the other asked questions. The basis anything can be used is based on biokinesiology, or muscle testing. This is not without merit, but I think quality is important to me and there are more things at work in the use of anything properly understood.
