well by the pictures i dont think the dowell method will work. i think myself i would get an oversized plate and fasten it, maybe find a aluminum stud possibly with a stud finder that you can get a good sturdy place to fasten it to and maybe even some 2 part epoxy to help, then tap the screw holes for the strut plate, luckly it is not where it will show up.
just my idea,
al meyer
3931fb
az
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