long term dampening needs compress the dampening pads 18 in their vertical direction resulting in that the bars 2 get into contact with the annular projections 17 the system is assembled by first applying the dampening pad 18 to the level adjustment means 29 such that the annular projection 17 is inserted to the through hole 21 of the dampening pad 18 thus the dampening pad 18 rests on and is supported by the contact surfaces 23 of the level adjustment means 29 during this application guiding and retaining means 19 may be used for guiding the dampening pad aligned with the level adjustment means 29 such guiding and retaining means 19 may also be useful if pre assembling of the bar system 1 is automated thereafter the level adjustment means 29 and the dampening pad 18 are pushed in between the shanks 6 of the bar 2 such that the dampening pad 18 is facing the bar 2 during the application of the bars 2 each end of the shanks 6 applies a force to the bevelled edges 16 of the engagement means 28 pressing the arms 14 towards the level adjustment means 29 such that the bar 2 and its shanks 6 may enclose the level adjustment means 29 however when the engagement means 28 moves towards the level adjustment means 29 the engagement means 28 may only be pushed to the wall 25 not further thus the wall 25 will prevent the engagement means 28 from being pushed such that the resilient joint 9 will break off such a risk exists when the engagement means 28 are pushed away from the level adjustment means 29 for engagement.