Extruder rear replacement - spring and brass PTFE Fitting piece  

Extruder rear replacement - spring and brass PTFE Fitting piece

Hi all,

I made the mistake of over-tightening the extruder rear's M3x40 screw (the tightening screw with the spring on it) and then the screw got completely stuck and I cannot remove it at all (it just keeps turning forever). My conclusion was to completely replace the extruder rear, so I bought a replacement part. However, I was unaware that the M3x40 screw had a spring on it and that the brass PTFE Fitting piece (the piece that fits into the extruder rear and holds the PTFE tube) is not included. I have three questions:

1. Is there somewhere I can buy the spring that fits on the M3x40 screw?
2. Is there a guide on how to fit the brass piece (that holds the PTFE tube) into the extruder rear? I searched your database but cannot find! I saw previous comments in the guide that this brass piece is pre-installed in the Extruder rear but that is not true.
3. I'm assuming I can remove the brass piece from the existing damaged extruder rear and reuse it in the new extruder - are there any other pieces I might need?

Thanks so much to any responses - I am a total beginner so appreciate any insight you might have.

Thank you!