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Seat is becoming slack & no longer self closes. Pan seems to be all in
one with cistern on top of back. How do I get to the bolts holding
the seat to tighten them. Will I have to pull the pan away from the
wall?

my soft close toilet seat has tiny grub screws on the back of the hinges
(towards the cistern). I undo these with an allen key and the seat can be
removed. The pan has some studs installed which these grub screws grab
into.