RJS wrote:
More pictures now he https://picasaweb.google.com/OldGit007/WCHinges

Looks like a real pain the in arse access-wise.

I still think that if the seat hasn't detached itself already from the pan,
you'll be fine to remove the grub screws and tighten up the retaining pins.
You could always wrap some string beneath the hinges around the pins if
you're paranoid about them dropping down into oblivion.

If you DO need access to the underside of the hinge pins, it looks like
you'll have to strip the whole shebang down.

I would say do it sooner rather than later as eventually one of the pins
may completely unscrew from its backnut and then you definitely will have
to strip everything down (unless you're lucky and the pins are retained by
a system - expanding plug say - that only needs access from the top).

Tim