Methods and systems for hosting a betting pool are disclosed. The tool provides symmetrical shielding of the coils and grounding at either the transmitter or receiver end only to reduce coupling of induced currents into the received signal. The sodium percarbonate granules according to the invention display improved storage stability combined with high internal stability and a high active oxygen content. The male connector housing 13 has an inner housing 25 formed with a plurality of looseness prohibiting projections 30. Tension is then applied to the wire while the cap is tightened against or within the bone surface to thereby apply an appropriate amount of pressure between the surfaces of the fracture.