Does it mean different if I say "every single part of it"? Maybe "bit" sounds smaller?
Native speaker’s answer
Rebecca
No, it would mean the same thing to say "every single part of it" instead of "every single bit of it". "Bit" could have the implication of something being smaller, but in this case, it just means "a part". So in this context, saying "every single part" expresses the same meaning.