Thanks for the tip . . . and for knowing which bolts I'm talking about! I've got a small dremel that I use to make jewelry, so I'll try that.
The RoboZip with the grinder attachment I was thinking about buying awhile back sure would come in handy at a time like this. :)
"Those tank bolts are tough to get to.......I like to break out the "dremel" with one (a couple) of those cut-off wheels to remove the head of the bolt from inside the tank.........and on to replace them.......doug"