with approximately 7 increase in total inertia compared to conventional damper designs in an exemplary method of manufacturing a torsional vibration damper according to one embodiment of the present invention a hub is formed with a spoked web and a radial flange extending from the web an inertia mass is formed with a substantially continuous outer rim and an intermittent inner rim such that multiple projections defining the intermittent inner rim extend through the openings between the spokes of the hub web a sidewall connects the outer and inner rims of the inertia mass defining an annular channel encompassing the radial flange of the hub a first elastomeric member portion is positioned between one face of the radial flange and the sidewall of the inertia mass a second elastomeric member portion is positioned adjacent an opposite face of the radial flange a compression ring which may also contribute to the active inertia of the damper is then coupled to the inertia mass placing the elastomeric member portions into compression between the respective faces of the radial flange inertia mass and compression ring the vibration damper may be assembled by stacking the hub elastomeric member and inertia ring then compressing and.