mjbarnard wrote:
Chris - the connection is exactly as you describe, except the bottom
nut is actually built into the hole in the pan.


###### bolt head
--##-- washer
\\##// rubber cone
=====##====== cistern floor
~~##~~ plastic washer
@@@@@##@@@@@ W.C. bowl
#### Nut

So the cone has to compress onto the bolt (hope it's not a set bolt -
does the thread go all the way up to the head?) as well as the cistern,
else it won't be watertight. Not a lovely design IMO. The plastic washer
won't help a lot, as of course water may pass it (between the bolt and
washer) and seep through the threads of the captive nut. Does the cone
fit tightly onto the bolt shank? If not, can you use a larger bolt (if
you can replace the captive nut)? Could you use silicone to stick the
cone onto the bolt, let it go off, and then do up the bolt with more
silicone to seal it? 1/8" PTFE gland packing?