Removal of grass hinges

Hi everyone

I'm a newbie to the site so please forgive any mistakes.
I have some 10 old grass hinges in my kitchen. A couple are broken so I was going to replace the lot with blum hinges with self closers. My question is how do you remove the old Grass hinges without destroying the door. The grass hinges in question are two piece, in that I can remove the arm but the hinge cap is still in the hole. How do you remove the hinge cap.

Any advice would be welcome


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