semispherical surface 60 rotatably rests in the depression 66 of the cup 62 and the arm 26 or 27 extends away from the joining side 72 of the semispherical surface 60 the generally cup shaped end coupling 28 fits over each semispherical surface arm and cup assembly each arm 26 27 extends from its semispherical surface 60 through its respective hole 106 as described above the arms then extend into the spring casing 22 the long arm 27 connecting to the planar spring 20 and the short arm 26 connecting to the inner hollow member 40 rotation of either semispherical surface 60 results in movement of its arm 26 27 when the short arm 26 moves the flat end 37 of the opposite arm 27 may optionally contact the flat end 36 of the short arm 26 to acts as a stop to limit excessive movement similarly when the long arm 27 moves the flat end 36 of the opposite short arm 26 may stop excessive movement via contact with the flat end 37 of the long arm 27 thus the articulation components 24 25 secure the arms 26 27 in a rotatable manner to the spring casing 22 to permit the stabilizer 12 to obtain a variable curvature the assembled stabilizer 12 can be rotated into locking engagement with end caps or end couplings of other stabilizers for multi level application in fact fig5 illustrates one coupled stabilizer 12 having a coupled end cap 120.