The hinged bit with a hole in it has an over-centre hinge, so it will 'snap' into position over the pimple. Your's may need a little oil in order to achieve this.
You could do worse than have a look at what Cheney have to offer. Chances are that they made the catch which you have. It's very much their house style.
The hinged bit with a hole in it has an over-centre hinge, so it will 'snap' into position over the pimple. Your's may need a little oil in order to achieve this.