I've got the same problem with mine. Onthe way to scotland a couple of weeks ago the drivers one was all over the place-funny now but at night time in torrential rain no good! Pair of new arms at reg vardy in stockport 50 notes! I have tightened the arm up and i'm percevering for now. Might go for the tipo or volvo jobs though. Whats the single wiper conversion by hormann like?