Does anyone know the specs of the small spring that goes where the picture indicates? The spring is a part of the temperature controller assembly (it appears as if it makes the air mix controller **** stay more securely in whatever is the selection by pushing the small square part into the space between gear teeth). Would this spring be listed in the service manual or would it be available only as part of a larger part? And... if it's not available as a separate part (the auto parts store didn't have anything) any suggestions on where (or in what lol) I might find a comparable replacement?!! Thanks!