Interesting use of closed turnbuckles for your diffuser. Now I know how to repurpose some of my boat turnbuckles when I get around to getting a diffuser.
At first they were out of necessity - the diffuser tabs at the clam were broken - but I love that I can actually adjust the angle of the dangle. I have since added a second horizontal plane so I have a dual plane diffuser with enough rigidity to not need the license plate mount. This gives me a couple inches of adjustment, but the turnbuckles do rattle if they aren't preloaded or have rubber added in the right places. That's just due to my cheap selection. When it is all painted and cleaned up, I am going to make a thread for it.
"Lots Of Trouble; Usually Serious"