Ball-Spring Latch for Doors or Cabinets

This is a simple spring/ball latch to keep a door closed but not locked. I am using it on a full size door but it is often used on cupboards and cabinet doors.

The trapped nut and the bolt allow adjusting the tension of the spring.

The hardware I used is:
* 1 x M3 bolt (20 or 25mm long)
* 1 x M3 nut
* 1 x Spring (I am using one from an [IKEA PRESSA clothespin](http://www.ikea.com/us/en/catalog/products/30108607/))
* 1 x 11mm steel ball