Now we focus on the malfunctioning button. Either the right or left click although the method works properly for any button which uses the same Omron switches

These have a plastic cap which covers the metal mechanical mechanism. We have to take it of and leave the bronze metal piece uncovered. I used a thin blade to perform the latter.

Be careful not to brake the plastic cap while doing this step and be aware of the small white piece which is vital to complete the clicking process.