With my wide Mustang axle I've decided to take the path of utilizing longer support arms for my 4-link. This type of mounting isn't covered in the book, so my thoughts were to put a threaded sleeve in one of the vertical supports. (not "H", but an additional vertical support that I installed at the end of "K1, and K2".) Also adding in an "L" Br@cket on the front of the tube to sandwich a rod end between that and the threaded insert in the frame.
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As far as using a threaded insert, all I can find in 1/2-20 are coupling nuts, and they aren't very locost, or do they look like anything special. A thought that comes to mind is using some 3/4in tube with .156 wall. (I found some at
http://www.stockcarsteel.com) which gets me down to .438" and the hole size for 1/2-20 threads is 29/64, or close enough to .45" an easy step up.
What is the consensus, on the strength of that setup? Is threaded tube going to be strong enough? My thought is that I could pean one end of the insert to create a type of stover nut, or just red-locktite the bolt into place.
Am I over thinking this? I feel like just welding a nut into the frame wouldn't have any strength in the unlikely event of twisting loads.