Steve Barker LT posted for all of us...
I don't top post - see either inline or at bottom.

Look at this picture of my new panel. If you look closely just immediately
left of where the neutral service wire hooks up, there is a lug big enough
for a 4ga. Perhaps yours has one of these?

http://www.barkerranch.net/images/farm/Elect016.jpg

Hey Steve, how is this panel being supported? Usually put washers under the
mountings screws...
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Tekkie