![Name: Brake swivel instructions 1.JPG
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Based on what some others have reported paying, you did pretty well at $300.
Like you, I also have a electro-mechanical background, and usually have success "figuring it out as I go", but without an explosion diagram or similar, that swivel fitting is a tough nut to crack!
*I posted the photo from FB below so we will always have it here, even if the post is removed from FB for any reason.