Need help fixing switch of laser

Hello.

I finally got a specific laser pointer I wanted. I put batteries in it and it worked. But it stayed on, the switch does not turn it off, though it worked for 3 or 4 times.
I opened it and wanted to see if there is a loose contact or something else. A very small spring and a tiny metal ball fell of a hole AND a small piece of plastic that looks like it broke off.
Anyway. With batteries installed, it works but I can NOT turn it off with the stwitch. The switch can be pushed from side to side and I think has contact to the tiny metal ball that pushes into the spring. Pushing the ball/ spring with somethign else does NOT turn the laser off.
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Can you guys pleeeease help me here?

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Anyone please?
: (

I was sooo much looking forward to this laser and it finally arrived and now this. I really need help.

Is this something out of any alignment equipment or maybe a gun-mount of some sort?
I have no idea whats in there but im sure youre at the right place someone might help you fix this so be patient.
A little more information about the insides where switch is placed might help even better.

It´s a cheap laser from DX:

Adjustable Red Laser Gun Aiming Sight for 21mm Rail (2 x AG10) - Free Shipping - DealExtreme

I will take more pics tomorrow.

The tiny small plastic piece broke apart...