Thank you.
I have opened the back up and it looks like this: I have no idea what I'm looking at but it seems well greased. The blades also have a small hole which looks like it could be a screw that has since gone missing?
I'll attach some pics
Also the noise has become more jittery and frequent like its hitting something I've uploaded another video
https://youtu.be/qWGYruBQWC4
I'll try and reduce the voltage on a 100v transformer too