A permeable material compacting method includes, forming a cavity between a membrane and a structure, porting fluid to or from the cavity, positioning permeable material adjacent the membrane, generating a differential pressure across the membrane, deforming the membrane, and decreasing volume of the permeable material. The archery bow further comprises a dampening element made of a vibration dampening material mounted to the proximal end of the elongate member between the proximal end and the bowstring. A second positive pressure supply pathway supplies the gas at a second positive pressure that is lower than the first positive pressure. Hence, it becomes possible to appropriately suppress an occurrence of a cyclic abnormal sound and an increase in the vibration noise during the occurrence of the abnormality. In this way the distributed feedback loop circuit more readily provides a substantially exact match for the distributed delay experienced by the signal propagating through the clock signal distribution network that the PLLDLL circuitry serves. The ring may be made of a material that does not produce injurious fragments when the explosive is detonated.