I might be being really cr*p and girly here but I just bought a decent Abus lock for Liesl and cannot work out how to fit the holder onto the frame. The instructions seem to imply I should have a plastic thing that wraps round the bars. I have three - two with ridges on, one smooth. I also have some screws but none of the plastic bits seem to have spaces for screws. And the plastic cup things don't fit round any of my tubes! I'll be the first to admit this kind of thing isn't my strong point, but I wonder if I've been given the wrong attachment things. The bike shop where I bought it doesn't open in work-friendly hours so I'm loathed to go back. Any bright ideas?