Solid resilient compound retaining the outer end of a bimetallic helical coil spring of a temperature responsive viscous fluid drive to a clip. The clip is secured to the cover plate of the drive. The inner end of the spring is secured to the valve shaft while the outer end of the spring is configured into a bight having a straight center portion inserted within a slot in the clip. A liquid compound is placed in the bight and surrounds a portion of the clip and fills the bight. The liquid solidifies to resiliently retain the outer end relative to the clip. A method for assembling the spring, valve shaft, cover plate, and clip is also described.