Blakes Lavac Hand pump

Thanks for your help. Unfortunately, it doesn’t show which way round it should go, only that there is one. Maybe it doesn’t matter!
 
Hard to describe, and dont have one handy to photo. Theres like a hump in the diaphram, and that goes in the front body assembly. Its sort of obvious by examing it all.
 
I don’t recognise your diaphragm but thanks. The you tube that was sent, I stopped at the moment of talking about workings inside and could clearly see the right way round. Thanks everyone that helped me.
 
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