bending stresses are minimized and the torsional stresses are spread over multiple coils in the end mounting region turning now to the end mount 18 more specifically as seen in fig5 there is a keyhole 24 created this keyhole 24 extends through wall 26 of end mount 18 in order that the end mount 18 may fit over the end fixtures 20 and 21 attached to the outer spring the keyhole 24 has the shape as shown on the wall 26 of the end mount the hole shape is configured to provide clearance for fitting over one end of the fixture while being small enough to engage the inner spring mount or other stop as discussed below the wall 26 of the end mount is preferably a flat surface on which a snap ring 22 rests to hold the end mount 18 in place as shown in fig2 the end mount 18 also preferably has a recess such that it can nest over the inner end mount 14 and the inner spring 12 an inner surface 36 of wall 26 in the end mount 18 rests on the inner end mount 14 or the flange 15 if a flange is.