2nd update on Zus40 soak, nothing has moved as yet but it has only been soaking in a small amount of INOX MX3 pen - oil, for a week, as this Zus40 seems to have been possibly ground dug ,after being underground for 50 to 60 years ,it might take a month or two to loosen up if it fails all i have to do is clean off the pen-oil that i'm using and it will not have damaged the Zus40 at all.