The lower section is just a simple bolt to undo, cant remember exactly how I did it. Half tilt the backrest back and lift the base up, should be able to slide a spanner in and get it undone. I did mine when fitting a seat to cover.
As for the top mount with retractable mechanism.....I have not done. Unscrew the plastic guide in top of chair where the belt come out and have a look in there.
Good luck!
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