How to separate new door clips for install?

[Shel155]

Originally Posted by HPsauce

This is why they generally break when you take the door cards off and you need a load of new ones to refit.

Though I noticed when I was replacing my rear window a while back that someone had taken the card off previously and used a different design of clip that didn't break and seemed to be just as secure.
(Note to self - next time take some pictures for reference )

Yes, reusable clips would be great. I knew it was possible, just need to be willing to spend some time experimenting.