I picked up a Stoner Jr 102 yesterday, and I'd hate to drill the bottom lock.  
I was wondering if this lock is a generic lock as the lock isn't marked and if there is 1 key that works on all of the bottom sections?
I have found the efforts of finding Stoner Locks over the years has been exhausting.  I would gently drill out the lock and be careful not to ruin the tail piece on the other side of the lock.  Many times I just end up replacing the acutal lock core.  The other pieces /  hardware can usually be reused..
You can get a cabinet lock at Home Depot for $4.95.
Jared