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Drop the thumb screw / nut / spring assembly into the extruder body.

The screw will slot into the nut-channel in the extruder body, and the idler arm will slip onto the motor shaft.

It is normal that the shaft sticks out slightly from the lever.

Make sure that the nut slots into the channel fully and that the idler arm is pressed all the way onto the motor shaft.

Your assembly may look like either photo above, depending on whether you're using the thumbscrew or the dome screw.

Do not compress the spring without the Titan lid on!!! It will go flying out and you will lose it. And it could hit someone in the face.