Vestax Vci 100 Midi Controller "optical encoder" Questions

...optical encoders. OFTEN the encoders are damaged when something hits the wheel. I have found some that have pushed the shaft causing the back of the encoder to un-bend some metal tabs that hold it ...

...and look at the sensor. If it is an optical pickup, then use the canned air pressure to clean the area of dust. If it happens to be a mechanical switch, then the mechanical encoder has to be