The piece at the yellow arrow pulls out to release the lock.
Attachments
F76AE2D5-C537-4147-80BF-7B3554B51FD9.jpeg (152.47 KB, 127 downloads)
LOCK RELEASE CLIP

Kevin
1951 Chevy 3100 work truck
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Photos
1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.