I know a couple of builders who did not install the support strut and wish they had. Without it the lightweight alternator arm (the slotted piece) must bear the burden of a lot of vibration and this quickly leads to cracking.
Like you, I thought the piece would be difficult to make. It wasn't exactly easy but I did it and it was worth the effort.
I thought that Van was now providing this piece pre-made. If not, check with PlanePower or B&C, as I'm pretty sure their alternator package includes this piece and perhaps they'll sell it to you.
Chris
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Chris Pratt (2020 VAF DUES PAID)
RV-8 Flying, 850+hours
N898DK
Lycoming O-360-A1A, Hartzell CS
52F (Northwest Regional, Aero Valley, Whatever, TX)
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