Removing the louvers makes the job a damn site easier and largely removes the need for this device. ...if you don't mind re-fitting the louvers after :-) You comment about the bar moving in its "hole". My trick is to use a screwdriver in one of the bolt holes to gently lever the opposite hole into place - then all the person on the wrench needs to do is to rotate, and that thing can get quite heavy very quickly! Martin #1458