There  is an alternative, cheaper and easier way to make a shertz beam- take a look at my engine on the ACRE website- I made a shertz beam out of a single 4x4x1/2 piece of 6061 angle, cut down to 3x3x1/2. Couldn't be simpler. Lightening holes could also be cut in it. Materials were about $10 or less. I cut down the aluminum angle on my table saw with a carbide blade.

Brian Trubee

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