I'd be afraid that if I posted production photo's, osha would find us and I would have no place to play.
Sorry ,I don't have a single picture of making them. My son has some that I may be able to post on his return.
Copper water jacket is right. You can see the fill hole about 2" in front of the trunnion ring on top of the barrel.
Since my computer was eaten by the google virus, I have not ben able to size photos or I would post some of the original bolt. It has 2 lock lugs which rotate behind stops in the reciever.
The e-screw operates from under the trail by a wheel that ties to the barrel by long straps.
Photo of the original gun. Sorry, the only one that will fit.
Bob