Reich tap in our Eldiss kitchen-the chrome aerator has fallen out of the spout-there doesn't seem to be any cracks etc. There is a 'lip' inside the spout that corresponds with a groove in the aerator which is easy to line up-there is a rubber seal inside the tap-but the aerator will not push back in despite considerable pressure-we've tried Vaseline no luck-any suggestions please ?

Kim, April 2014