Attached is the picture of circa 1987 dead bolt lock from the back after removing the back plate. Could not find manufacturer name but seems like Kwikset based on key types. The front of the lock would not come out even with pry bar. How to remove the lock for re-keying?c
Use a flat head screwdriver to unscrew the hollow bolts to the left and right of the center shaft. It's a little strange if you've never seen it before, but those are actually barrel screws with internal and external threads.