National have just had a recall on a batch of 1/2 x 1/2 inch joints (part number TSMX8T)after a couple of failures, I am told, on NASCAR racers. This recall involved me in taking a complete GTD40 rear suspension off and replacing all the joints. Frank
I am running Aurora joints throughout, 1/2" x 1/2".
I have made all the suspension rods from 1" chrome moly tubing and when I started adding up the machining required to make all the fittings to hold the rose joints, I decided to farm them out to a machine shop. They came back beautifully made, and perfect for the job.
I had more made than I originally calculated, and for you guys building from scratch, I found they were perfect for inserting into the chassis at the right point by drilling a 22mm hole with a hole saw and welding them in. They are the right length, and threaded (1/2" UNF), and if I wish to through bolt I put a 1/2" drill through them. I reckon it saved me days of effort. I had the rear suspension made in one weekend!