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How is the locking mechanism inside the cone supposed to work?

My first print failed as the mechanism fell over during the print.. So then I created supported and printed it again.. And once I managed to release it, it just snapped as it was inline with the grain/layers of the print.

I assume its supposed to act like a spring.. But is seems a bit thick to do this, without snapping.

My plan now is to put some 'foam' in the square recess which is left, which should add some 'friction'.. But this isn't ideal.

Am I doing something wrong?