I've a question for a cage for an open SPO car.

The main hoop needs rearward facing diagonal supports at least at a 30 degree angle to the main hoop. Can these stays be pinned per a method in the GCR? By pinned I mean so that the main hoop might have a strong bracket welded to it and the support bar can be bolted or pinned to it thereby making it removable.

I have a car with a rear clam shell that needs to pivot rearward. If these stays are welded to the bar and chassis, and pass through the clam shell, then it'll be rear hard to pivot or remove the clamshell!!!! I've seen some other cars with pinned bars from time to time but am looking for some clairifcation.

Thanks,
Ron