Toilet Slide problem

DuncR
DuncR Forum Participant Posts: 3
edited August 2014 in Parts & Accessories #1

Hi All

We have an old Thetford bench in our '91 Lunar 460-2. Like this: 

photo Lunartoilet_zps055f3829.jpg

And the casette is one of the old all beige ones.

It's been fine, replaced the top seal last year after advice on leakage on here and it was fine.

But I've now got another problem :)

Rotate the toilet knob to open the slide and it only opens about a third of the aperture. It will move over if persuaded with a finger :(

Take the casette out & manually rotate the slide knob on the casette itself and it opens all the way. Rotate the toilet knob without a casette and it appears to have full & free movement - it's only when the two are mated up that it won't open fully.

Any ideas? - Dunc

Moderator Edit:

I've replaced the URL with the image which I've copied and pasted.