Hemi Swapping a perfectly good 70 Duster

I forgot to mention I also added a secondary return spring to the throttle body. I'm not sure why I didn't think to add one earlier on, but it's on there now for safety reasons. Who knows if that Chinese knockoff throttle body will decide to quit doing spring things.
Racerjoe, can you share your idea. I need to add one to my TB as well just for safety reasons.