a shoulder with a turned circular surface 21 serving as a bearing surface for a centering ring 30 when casting the ring 11 of the second mass 2 there are created as well circular arcuate depressions 22 with an essentially u shaped cross section and arranged in pairs between the depressions 22 in each pair there are circular arcuate slots 23 into which the inner fingers 7 of the first mass 1 extend the centering ring 30 is formed by a relatively thin metal ring which can be stamped or cut and has a radially inner surface 31 which forms a bearing surface and rests against the surface 21 of the ring 11 the ring 30 is made in one piece with four oblong projections 32 evenly spaced about the periphery and which lie in the channel 17 of the ring 11 these projections are 34 screwed into 34 the center portion of helical springs 40a 40b lying in the channel 17 the ends of each spring abutting against the fingers 5 6 and 18 respectively of the masses 1 and 2 respectively as can be seen in fig2 the projections 32 are shaped and arranged so that when the flywheel device is not subjected to torque the projections 32 lie midway between pairs of adjacent groups of fingers 5 6 and 18 as shown in fig2 the figure also reveals that the springs 40a lie without play between the groups of fingers while the springs 40b have a small play 34 s 34 with the adjacent finger groups on either side the disc 1a of the mass 1 is made with cast and possibly turned depressions not shown which supplement the channel 17 and the depressions 22 in such a way that essentially closed cavities are.