Laser collimator / contact problem when setting different brightness levels

Product Description
If the intensity of the laser light in a laser collimator varies at a certain position, or the laser light even goes out completely, then a contact problem with the resistance dial may be suspected.
We open the battery cap by turning it. We remove the battery from its socket.
A circular ring holds a disc, on the underside of which are the resistors that define the different brightness levels.
If we remove the disc, we have a clear view of the contact springs underneath.
We bend these contact springs upward using a flat screwdriver, thereby increasing the contact force on the contact surfaces of the disc and the resistors.
Now we can reassemble the collimator in reverse order.
Depending on the position of the rotary switch, the collimator should now output a defined laser brightness again.

Image 1: Battery cap
Image 2: Exposed contact springs