@Iminei I do tighten it up but am careful not to overtighten, I then check it doesn't wobble/isn't loose.
However, after a little while it becomes loose.
I think it might be connected to the movement (vibration) of the machine stitching which makes the screw holding the post in place to become loose.
I've written an e-mail to the dealer (who does have a website but with no terms and conditions!!) and will see what the feedback is.
I don't want to have a "fight" about it, but £899 for a new machine (purchased late October 2018) which appears to have a fault is not something I can just shrug my shoulders about.
I shall post another thread in The Café as I have learned something interesting about payment plans today which other forum members might find useful to know ...
Annie