thin section 78 extends over the other about 180 degrees of the circumference of the disk portion 72 due to the difference in the shape of the perimeter portion 74 of the irregular flywheel 42 rotation of the irregular flywheel 42 creates a vibration the motor 44 has a housing 80 and a shaft 82 the motor housing 80 is coupled and preferably fixed to the housing assembly 40 the motor shaft 82 is coupled to the irregular flywheel 42 and structured to rotate the irregular flywheel 42 as indicated by the arrow u201c a u201d when the vibrating device 24 is assembled the irregular flywheel 42 is disposed within the enclosed space 52 and supported by the bearings 68 the motor 44 is coupled to the irregular flywheel 42 the side plate 66 and the motor 44 cover the axial access openings in the housing assembly sidewalls 58 60 thus except for the drain hole 69 the only openings through the housing assembly sidewalls 58 60 are the arc shaped slots 64 disposed adjacent to the maximum diameter of the irregular flywheel 42 further an air filter 100 such as but not limited to a brush may be disposed over the housing assembly at least one opening 62 in this configuration the rotation of the irregular flywheel 42 causes.