Random thought:

Looking at the $80-250+ for a package of plastic VG's, and the thought occurred
to me. This is pretty expensive (relatively speaking), for something that seems
pretty easy to replicate for cheap.

I'm wondering if there is any reason VG's have to be T-Shaped, seems like you
could simply cut them out of .025 aluminum angle. One side of which was the
attach surface, with something like 3M double sided adhesive tape, and the
other side being the blade in the airstream.

Whether a T, or an L as long as you had say 20mm or so of attach footprint
that seems like it should work just fine.

You could easily fashion half left, and half right side pieces so the flat
footprint half of the L ended up on the upwind facing side.

Regards,
Jeff Hays