I hope the above photos help? The MTH part number is FB0000014, wireless drawbar (6P) (45mm) (vertical pug). Midge at MTH was, as always, very helpful in tracking my order down for me. I'm really hoping that this is a more permanent fix to the drawbar slipping issue. I've tried sink washers with some success and shrink tubing, with even more success, but this one is new to me, and since MTH manufactured them, I'm hoping for a longer running period before the collar slips down the tender post.