I have a 1934 Master sedan.
To remove the existing lock you must have the key.
Then: Position the lock in the unlocked position(key cuts down)
Gently jiggle the key and turn the key counterclockwise a small amount to the 11:00 position. The cylinder will start to come out-don't allow that.
With the key in the 11:00 position, gently lift up on the latch/spring parts with two fingers and they will slide out towards the bottom.
Then push in and return the key to the 12:00 position and remove it. Remove the nut and washer and lock.
I thank the guys from VCCA for the help on this.
Good luck, Jerry
P.S. I just went to the garage and disassembled mine this way.