That photo is one I found on the interweb. It was the only one that I could load here. There is a hole drilled in the one end to make mushrooming the end easier without a rivet die. No threads inside.
There more photos here.
https://www.ebay.com/itm/123530618334
Rebuilding the old regulators was the only option for me. No one makes reproductions for the rear doors on 67-72 Suburbans. The factory rollers were riveted on the 67-72 trucks. Fortunately they use the same rollers as the 64-67 A-bodies otherwise I would have had to make my own.
Here is a video showing the replacement of the rollers on a 55-57 Chevy. Similar process with the exception that apparently the rivet on those cars is not recessed below the outside of the nylon roller wheel so he can use the vice to finish the mushrooming of the rivet without damaging the roller. I didn't need to use a chisel on the rivets. I did use a larger hammer so the rivet would mushroom with only 2 or 3 taps.
https://www.google.com/url?sa=t&sour...cxExRPKFvQGeEh