The cords around the screw are the tensioning/friction device. You don't need to mess with it. The blinds have a friction system that keeps the blind where you put it.
Like Albertaguy said, lift up the whole blind from the bottom to open and pull that bottom bar down down to close.
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Sherm & Terry w/rescue Eydie (min Schnauzer) & Charley (std Poodle)
SOLD:2015 Jay Flight 27RLS, GY Endurance (E), Days: 102 '15, 90 '16, 80 '17, 161 '18, 365+ '20
SOLD: 2006 Ford F350 PSD, 4WD, CC, LB, SRW, Camper pkg., 375,000mi
Full timing: Some will think you're crazy, some will be envious, just enjoy the freedom!
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