hi shaun

got some winders for the drawers i cannot understand why they don't make them a better fit, i have got round it by fitting some foam in the gap near where the locking pins go, you can still remove the tray but they don't move about.
i may have a spare add-on unit available soon, i have bought one along with a deep drawer unit which i am collecting tomorrow. to be honest i have too many units now so if you are interested in the add-on let me know, it will be at the right price.