Thanks Steve. Yes the switch is exactly like the one in the photo. Looking at the thin metal retaining clip in the picture, it looks like I may have put it on back to front, with the walls of the clip facing in rather than out towards the terminals of the thermostat. Not sure either, if the retaining clip sits on top or behind the rubber sleeve that goes into the inline housing or where the ties you mention should be attached to put pressure on the clip... Please forgive my stupidity but am a little lost here..