Mitre saw wobble?

Just bought a brand new Evolution 255SMS Mitre Saw.

Going to preface this with I'm a complete novice so might be overthinking it but rather be safe than sorry when it comes to spinning blades.

Here's a video of it running, I'm pretty sure the blade is installed correctly but is this slight wobble effect on the nut / arbor normal?

Couldn't upload second video of sound, but seems to have a slight metal sound when starting and then a ring at the end, can't hear the start bit but once it gets going sounds ok, but the ring I think is it just hitting the brakes?