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?
 
I can confirm, I bought it some months ago and after a long break-in period it sounds really really good. Normally I like to build stuff myself so I can adjust the sound exactly the way I want it to be, but with this amp I am absolutely happy as it is, no desire to tweak something.
As already mentioned the build quality is very good, massive case, silent 800W transformer and clean PCBs.
Just running a little bit hot, maybe in summer I have to lift the lid a little bit for ventilation.
 
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I also liked it very much right out of the box. And it gets even better in time. I really like to tweak, so made some that improved the sound I think. But always hard to tell for sure, since I cannot A/B test these changes. Anyway, fun to do and still like it very much. If anyone is interested I can share some of the mods?