I have just changed the syphon on a Twyford CC suite. It is about 10 yrs old. It is the type that has a plastic moulding which is screwed to the back of the pan. The cistern sits on this moulding. However the flush connector part of the moulding will not make a seal with the pan inlet. The rubber connector is badly deformed. I fitted a standard plastic flush connector, but it will not seal either.
If anyone out there is familiar with this type of suite I would be obliged if they have any comments as to how to get this joint water tight. If you know where I can get a genuine Twyford spare, that would be great. I have emailed Twyford and not had a reply. Thanking you in anticipation.