Not Ranked
I believe the aluminum boodies are & were gas welded.
Several years ago I watched a fellow gas weld aluminum mufflers for RC Control Planes at the manufacturing plant in the outskirts of Sacramento. It was a work of art to see the aluminum just reach the point were it began to flow and see him dab the aluminum filler rod in the puddle.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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