You should be able to unscrew the knurled end on the right, slide off the electromagnets, and pull/push the shuttle by hand.
I can't remember if they have detents, it could take a bit of a push
Reminds me of a vacuum cleaner noise. What's the black concertina hose, is that your intake? I forget.
Can you take it for a wee spin with that disconnected?
Probably not. But hey can't hurt to rule it out