I went the other direction--I had a S&G Group II mechanical lock and swapped it out for a S&G 6120 Digital lock and never looked back.
Not only is a mechanical lock a PITA (and I use them every day at work), but there was essentially no chance my wife would be able to work the lock. (Of course, to some that's a feature, not a bug, but that's another story).
Rob is right; the Group II lock footprint was standard, and the lock dropped right in.
I was a little hesitant at first to go digging around inside, but it's actually a pretty simple setup. There are some precautions, like making sure the relocker is secured so you don't permanently lock your safe while messign around, but that's easily dealt with.
Here's a couple pictures of the "innards" of my Liberty, FWIW. It might help if you dig in.
Pretty crude, really, but it works like a champ. The handle on the front moves that round bar back and forth under the lock body, extending or retracting the locking tabs on the door. A large tab extends/retracts from the lock body and stops the horizontal movement of the bar. That plate across the back of the lock body is the relocker plate. If you try to drill and punch the lock, that plate drops the spring-loaded relocker (to the left of the lock) and the door cannot be opened.
Guts of a mechanical lock, if you care. Remove the relocker, remove the back plate, release the dial, 4 screws hold the lock to the body, and bam, it's off.
Close-up of the relocker. You can see how I held it up and "filled" the hole with cable-ties so it could not "snap down" while I was working on the door.
New lock in place. Pretty easy, actually.
Not only is a mechanical lock a PITA (and I use them every day at work), but there was essentially no chance my wife would be able to work the lock. (Of course, to some that's a feature, not a bug, but that's another story).
Rob is right; the Group II lock footprint was standard, and the lock dropped right in.
I was a little hesitant at first to go digging around inside, but it's actually a pretty simple setup. There are some precautions, like making sure the relocker is secured so you don't permanently lock your safe while messign around, but that's easily dealt with.
Here's a couple pictures of the "innards" of my Liberty, FWIW. It might help if you dig in.
Pretty crude, really, but it works like a champ. The handle on the front moves that round bar back and forth under the lock body, extending or retracting the locking tabs on the door. A large tab extends/retracts from the lock body and stops the horizontal movement of the bar. That plate across the back of the lock body is the relocker plate. If you try to drill and punch the lock, that plate drops the spring-loaded relocker (to the left of the lock) and the door cannot be opened.
Guts of a mechanical lock, if you care. Remove the relocker, remove the back plate, release the dial, 4 screws hold the lock to the body, and bam, it's off.
Close-up of the relocker. You can see how I held it up and "filled" the hole with cable-ties so it could not "snap down" while I was working on the door.
New lock in place. Pretty easy, actually.