Thetford toilet not working

by Ann
(Ayrshire)

Hi would appreciate any help thanks, it is a fixed toilet in Avondale Mayfly, it will flush fine but the waste won't open, the flushing knob feels very tight, it will turn to flush but it's too stiff to open the bottom.

We have had the waste container out and put vegetable oil on it and it opens fine when it's out, so it looks as if it is the flush knob, does anyone know a solution or do I need to buy new unit?

Thanks

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