the invention the distance from either their upper or lower interface plane to the horizontal plane passing through the centre of gravity is larger than the corresponding distances for the other set ups with common wri 39 s 93 and 94 i e the following relations are valid this is yet another advantage if a balanced suspension set up is required while only a single interface plane is available for mounting the set ups and when the distance between the centre of gravity of the object 90 and this interface plane is relatively large i e about one half of the main horizontal dimensions of the object 90 an unidirectional damper according to the invention may be connected to relatively stable surroundings by virtue of mounting feet as illustrated by fig8 and 9 which show similar exemplary unidirectional dampers as those illustrated by fig4 a and 4 b a rigid connection between a lower foot 100 and the inner part of the lower spherical bearing 76 is realized by a lower pin 101 and a rigid connection between an upper foot 102 and the inner part of the upper spherical bearing 61 is realized by an upper pin 103 after mounting of both the upper and lower feet 100 and 102 to the surroundings respectively rotation of a unidirectional damper according to fig4 a and 4 b around it 39.