Replace Dartzeel NHB-108 clone AC inlet connecter/power connector

I am trying to replace the power connector for something better (at least that is what I think, see picture below) on my clone NHB-108. Seemed like an easy swap, but unfortunately it was not that easy: the existing terminals/spades do not seem to want to be removed. I am probably missing something here, but how do I remove these undamaged from the exisiting connector?
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Also, would these fit the new connector anyway?

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Never mind, I also replaced the internal power cables and spades. For those who might be interested and see how the power circuit looks like some pictures.

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Still curious though, how can the spades be removed from the old connector?