Removing Amacor window screens

A quick learner from NYC says:
What I expected to be the easy part isn't. The screens on an old, 50 inch wide Amacor window slide in an extruded channel but do not have springs on either side that facilitate popping the screens out of the channel. How are these screens removed? Thanks.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
I'm not familiar with Amacor windows. If possible, we would like to see some photos of the screen and window frame to give you some recommendations.
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