User 66.185.84.208 (who is blocked) contacted me again, claiming that he is User:kchishol1970 (who seems to be productive and not a vandal at all), and that he uses a static IP, not sharing his computer with others. The IP block prevents him from editing wikipedia under his user name. Indeed, this user stopped editing on March 9, a few hours befor the IP ban.
The Anome has blocked the IP for 14 days. I will unblock it and tell User:kchishol1970 to watch his computer more carefully ;-)
I will try to watch out for that IP. In case I miss more vandalism, just block it again, please.
Magnus