how to uninstall 83-003 for rescreening

A quick learner from Florida says:
How would you go about uninstalling the 83-003 to still be able to reuse it, so that the screen could be replaced?
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Tom from SWISCO responded:

Hello! In my experience, the 83-003 simply unscrews from the door. Where are you running into issues, exactly?

A quick learner from Florida says:
I have what appears to be an 83-003 (correct visual and measurements) on my door, except that the outside handle is riveted to the door. I unscrew the inside handle but it doesn't budge. I assumed I must be missing something. Maybe I have to pry off the white slide piece? I assume that is what is holding the spring loaded inside piece in place. I was going to attempt that, but if that wasn't right, I didn't want to risk breaking the white plastic piece or the handle itself.
A quick learner from Florida says:
I attempted again after your answer. I got it off! It appeared that some sort of goo had gotten between the handle and the door had adhered it in place near, and around, the screws. Thanks for your help.
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Tom from SWISCO responded:

We are glad to have helped. Please get back in touch with us again should you need help with another hardware project. 

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