My fin has the 2-nd bar from the top kind of tweaked where it doent have its proper strength. Comparing that part to the 3/8 piper channel.
The only difference is that the fin part has the edges rolled over about 20 degrees.
I think I can turn the 3/8 piper channel into that by pulling it through a simple forming die with some ball bearing rollers.

Anyone tried this ?

Tim