The door latch plate and the roller cams are adjustable.
The latch plate can be moved in to tighten the latching action. If you look at it you will see.
The roller cams should have an Allen key socket in the centre. These are offset spindles for the rollers. Turning with an allen key will move the roller in or out slightly. Each roller should have a mark on the edge of the roller to allow you to move each roller and get them to line up exactly with the frame.
When you get the rollers correct, adjust the latching action so the rollers just slide in.
Cledlyn
September 2008