I'm looking for people's thoughts on whether this spring is a bit too short. The original Dominator system exploded diagram shows a part that is as long as the probe itself: Part 30 here. Though possibly that shows it being extended. The spare part is a 29mm long spring over the curved ends: This is Judith's picture. One of my springs has broken off at the end link; I look at the one in the other similar action and it's distorted and stretched beyond the original shape in places over the rubber insert pipe that goes inside. The spring starts at 29mm and goes out to approx 75mm full extension with the probe in the barrel. All the spring specs I look at seem to show the max an 'extension' spring should be pulled out is less than 100% of the original length. Is this why it's broken? Has anyone used any other length of spring?