Was at my Friend's Locksmith shop this morning.
Had just finished making a set of keys for a forklift ignition and was working on some keys for a 67 Corvette.
My Friend called and said, "Today is the safety deposit box at the bank. At noon."
So,
Today on "Scott's Locks,"
We will explore safety deposit box locks.
The last time I described safety deposit box locks,
it was a Mosler 5700 Series.
Not this time.
This time it was a Sargent and Greenleaf 4500 series.
Completely different works.....
As you may remember,
The Mosler had alternating fingers for the "guard key" (held by the bank) and the renter all in the same "stack."

Mosler 5700
OK.
I got this.
First, I used the nose puller on the renter side...

Once I had the "stub" pulled,
I put the bank's guard key in, turned it and manipulated the renter side fingers to clear the bolt.
On an S&G, the "fingers" are on their own "stack."

Here the guard fingers are still in place, on the right.

Here I've removed the guard fingers to show that the fingers on the renter side merely need to be pushed down out of the
way and the bolt retracts.
Took about 3-5 seconds once I had pulled the nose on the renter side.
We already had found a new compatible lock with changeable guard key side.
I adjusted the lock to accept the bank's guard key, installed the lock on the door and started picking up tools.
I stamped the box number on the two renter's keys and handed them to the Gentleman.
My Friend took care of the paperwork while I headed back outside to drink the rest of my coffee before it got cold.
Got back to the shop and finished the keys for the Corvette.
Hope all have a Great Weekend!
Best,
Scott