damping member 13 is generally a toroid in shape but may also be disk shaped torsion spring 3 is compressed between arm 6 and pad 12 pad 12 is mechanically engaged with base 1 wherein tangs 120 engage each side of a tab 41 being thus engaged pad 12 is constrained against rotation relative to base 1 fig2 is an exploded view of the tensioner damping member 13 creates friction damping between arm 6 and base 1 damping disk 9 is also used to create friction damping between arm 6 and eccentric adjuster 8 frictional surface engages eccentric adjuster 8 damping member 13 and damping disk 9 are disposed on axially opposite ends of arm 6 damping member 13 and damping disk 9 each move rotationally with arm 6 while base 1 and eccentric adjuster 8 are fixed to the mounting surface such as an engine not shown pulley surface 71 may be flat multi ribbed or toothed to accommodate a suitable belt an end 31 of spring 3 engages tab 41 wherein tab 41 acts as a reaction point on base 1 the other end 32 of spring 3 engages arm 6 rotation of arm 6 is limited by stops 63 coming into contact with a tab 41 fig2 b is a side view of the wave spring the wave spring comprises multiple coils 51 each coil comprises undulations wherein each coil comes into contact with an adjacent coil at a limited number of locations approximately 120 u00b0 apart this description is not intended to limit the coil design.