If you're constantly frustrated with lines being cleated accidentally, check out this Keeper for your MK2 Racing Junior Clamcleats. The Keeper gives you the ability to keep a rope in or out of the cleat.
Transform your Clamcleat. The lead-in makes cleating easier with the added bonus of improving performance by holding lightly-loaded lines in the jaws of a cleat mounted upside down. Great for a spinnaker halyard and other quick running control lines.