I cant weld aluminium

And I dont want to take it all out, to get it done somewhere.
The other thing i thought about was riveting a plate over the hole with a cork gasket.
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My Build Diary -
http://davesroadster.blogspot.com/
*updated 7/6/11*
Best bit so far: Getting it running
Worst bit so far: Cutting steel for wishbones and engine mounts.
Most annoying bit so far: Generator packing up half way through welding.