Bit of a tidy up

a little metal prong (ie busbar prong) slides out into the MCB/RCBO
I thought the metal prong was fixed (as with any other 'comb' busbar, and the switching done internally. I've seen, but never played with these boards, so I could be wrong.
Yes, they have got to be really otherwise it would be a catch 22 - the screw hole would be covered or the prong wouldn't be out to get screwed in!
 
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