Prusa MK3S MMU2S Extruder Idler + Filament Sensor Sensitivity Increase

This is the exact Prusa i3 MK3S MMU2S extruder idler with one layer added to the part at the top that breaks the filament sensor beam.

I modified this piece because I was attempting to pair PETG and a Flex filament. I found that the Flex filament was too squishy to push the idler out enough to engage the filament sensor. I tried loosening the idler spring, but once it was loose enough to engage the sensor reliably with Flex, it was too loose to grab the PETG.

The only way to solve my probl