Hi Amarok. No screw on my shift and it is different to the pic. (lables on the left and updated -chrome etc) But some good news found that the the chrome shaft just prises down and the handle with the button comes off. That bit is similar to the part shown in your picture. It is a sealed unit and lookes like it might be a spring which is stopping the button or failing to push it out. So looks like I need to buy and replace this part. Thanks for your help - I thought the whole thimk was one unit (and probably expensive. Terry