82 Vanagon Westy, trying to replace the battery located under the passenger
seat.

Removed the "clamp bolt", but the bulk of the frame/cover assembly in there
seems to be riveted in. Not sure what removing this bolt did.

Tried to remove the current correct-size battery in there with a Lisle
battery removal tool (like a big pair of tongs)- that didn't work. Wouldn't
open far enough to grasp the whole battery, and if it did, nothing to grasp
on to. Also tried using a pair of long flat-blade screwdrivers to ease it
out. Also no luck.

Such a simple task, and the manuals I have don't give any direction at all.
And worst of all, no maneuvering room! ARRGHH!

A little help, please?