Rather than hijack a recent thread Albervin has started to assess interest in building a few of his version of a Brampton coil over, I will move any more discussion of the Works version I have here. Here is a picture showing the area of the rod where the fracture occurred. As you can see, turning the 1/2" rod down to use a 3/8-16 thread removes a lot of the strength of the rod, and if you consider that the minor diameter of the thread is just under .300" that is a lot of strength gone, (plus the stressed area at that corner).
Quite a few of these Works Performance units are used as Thornton versions on C and B Vincents front and rear, and other Brampton applications have covered thousands of miles with no difficulties. As far as I know mine is the only one to have failed other than one instance described of improperly locking up the mounting so it could not rotate. My mount was bushed and double nutted so it could freely rotate. I can only think that I may have overlooked something like the clearance of the Works spring seat to the Brampton spring lug or something obscure.
With my apologies to Ted Leno who I think drew it, I have posted the drawing he did of the conversion. since Works went out of business I don't think we will see many more of these adaptations.
I so liked the improved ride of the conversion that I am going to give it a try again by repairing the Works shock, but will make my own damper rod of a much higher grade of stainless and will thread it either 1/2-20 or 12mm to preserve more of its integrity.