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@Tjabo
Its possible to solder alu with zinc, apparently its stronger than welding and alot easier. Clean the alu surface, heat it to 400 C to get the zinc flowing, scratch the alu surface with a sharp stainless object (like a sharpend spoke) to break the aluminumoxide and presto! I tried to find a youtube video but failed, only got this article i swedish but you can look at the pictures for reference: http://www.classicmotor.se/artiklar/artiklar/20100212/aluminiumlodning-med-zink