Thanks Dave, I truly agree with your objections. Its like "never change a running system", I really dont want a post-revision error. Im quite miticulous when it comes to equipment maintenance and as we indeed have water with high calcium content, I routinely blow my housing dry after soaking. Some knobs are a little bit stiffer than others, the front dial is also a little bit harder to turn. But to be honest, this was the case from the beginning and hasnt really worsened since then. I always thougt that maybe the lubrication was not intense ex factory.