This is a real plumb bob, not a pole. I don't know what's in the flux, but it contains NO LEAD and will bond to aluminum. I ran this bead over the photo, then let it cool and tried to scrape the bead off with pliers. It went nowhere. The worst I can say is that you will need a pencil torch as even a 60 watt soldering iron does not generate enough heat at the junction to overcome the heat build up of aluminium.
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