This is no help....looks like it completely rusted & was cut off & replaced with electrical hardware :
http://weberkettleclub.com/forums/weber-kettles-accessories/super-awesome-vintage-weber-kettle/I think Rick's onto something here :
"Should just be a simple task of finding the original assembly instructions
"
Winz is finding some old ads, maybe he'll come across some more detailed stuff..........
Looking at this picture :
the two bigger holes back away from the edge held the hinge, right?
The little one up near the edge, but off to the right is newer.....you can tell because of the indentations of where either the bolt or washer was.....
The original hole must be the CENTERED one, right near the edge (which also looks like it may have cracked & been cut off a little bit at one tme).....
So, my bet would be that the "L" shaped bracket, curved to match the leg & welded onto the leg, had ONE bolt thru the other leg of the L which was not strong enough over time & broke just above the welds & maybe also across the other part of the L......
Probably wasn't much more complicated than that...Weber is known for simple & direct, until later on in history...........