In a previous post I mentioned twist bars to align doors to the bodywork, and I was asked for details. My D & F roadster has them. The bar is simply a length of 2" × 1/8" flat mild steel.
When fitted to the door the bar is twisted first and then screwed down at one end. This rrsults in the other end standing off the frame on one side.
When this end is screwed down, the screw closest to seating on the frame is driven first. Then the second screw is driven just far enough for the door frame to attain the correct twist to fit the doorway. Depending on how much twist is required, this may leave the bar sitting a little off the frame timber.
When I rebuilt the doors for the roadster I spent a deal of time on each corner joint so that all the timbers went together without the need for the twist bar. I can understand why the bars are used in a commercial situation. I will fit them, but there will be no tension on them.
Just for your interest.
Allan from down under.
I find that very interesting! Thank you.