How do you remove knife latches from the screen frame?

A quick learner from Gloucester, VA says:
Recently had to remove a screen on my MW window. Knife latches were brittle from sun exposure and cracked. How do you remove the latches from the screen frame?
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Paul from SWISCO responded:
We do not have a sure way to do it. They are difficult, we keep working at them until they come out.

What type of latch do you have? Sounds like they are made of plastic and the UV sun rays will make plastics brittle.

Please send us a photo with dimensions of the clip you are in need of.
A quick learner from Gloucester, VA says:
They are plastic and similar to your "generic" butterfly latches. In my case, the thumb latch snapped off. Finally got it out by trimming off a stop and pulling it through. Now to get a replacement.
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Mike from SWISCO responded:
Can you upload a couple photos of your plastic butterfly latches so we can take a look?
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