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Attach optical interruptor rod to sensor lever. Its end has a shallow wedge shape to help with alignment. Rear of extruder body has opening through which a finger can support the lever

Fin of interruptor rod should point up. Its small leg is uppermost.

Insert 2 x 5 x 10 magnet into magnet pocket below optical interruptor bar. If you previously had magnet positioned for armature, move the magnet to this pocket.

Magnet pulls M2 screw downward and makes optical fin block IR sensor. When Bowden drives no longer have filament between them, idler door closes further and swings lever upward. How far it lever moves is fine tuned via a screw on idler door.

Here is the internal filament lever sensing filament at Bondtech

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