I've got an old Hurst T handle shift knob. It was in a Challenger I bought back in the mid 90's and it was old back then. I assume it is a 70s or 80s part. Does anyone know what thread is cut into these? I know they were sold with adapters so they could be mounted on many different shifters. I don't have any adapters and want to use it on a project I'm making. I looked up a new one on the Summit Racing website and those are listed as being 1/2x20 thread. The one I have is larger. Putting a tape across the hole it measures 11/16". I can take it to the hardware store and try to match up something as long as it's not some weird thread.