Hi all. You have to excuse me it my first post. I was looking for a little help please. I have the flux version. Bashed around a bit manged to damage the sterring arm. Im trying to replace but finding it difficult to take part off. The screw seems to spin as its connected to a smooth disk at other end and i cant seems to grip it. When i turn the screw it just keeps turning. I dont want to over do it and thought id ask here if anyone can help. I have included a picture of the part. Thx in advance guys