[klondike98]

The can actually has three additional lugs that come through the bottom of the mounting wafer which can be soldered and are used as a B- connection for several other components in the set.  Those 3 B- can lugs are twisted slightly so I suspect they are what holds the can shell to the mounting wafer.  So I'll drill an additional hole through the base and connect the common negative to one of those lugs.  The can will be at B- and the three positive leads will come through drilled holes next to each of the positive lugs.  I just need to moat the lug bases that touch the rubber and insulate the positive leads that go through the rubber and wafer base to ensure they don't short or leak current to B-.  The can has a cardboard sleeve that fits over it for insulation from idle fingers and I will probably just slip that over the base to cover the three new caps.  
You can see 2 of the 3 B- can lugs in the photo below.  I also labeled the 3 lugs for the positive end of the caps though you can only see 2 of them.
[Image: https://www.dropbox.com/s/epg21qujuqdph8....jpg?raw=1]
[Image: https://www.dropbox.com/s/jjr76cas3rqpsv....jpg?raw=1]

You'll see that this multicap can is actually an old repair since it is only a 40-40-40.  There was an additional 30uF cap tacked in place under the chassis to bring the cap up to 70uF.
[Image: https://www.dropbox.com/s/k3hibqt5hgyygb....jpg?raw=1]

This is an AM/FM set and is pretty well packed into the small chassis.  Its going to keep me out of trouble for awhile!