[Andy]

You need to cut the swedges out with a hole saw. You can then push the studs out. Serrated modern studs can be used. I did a lot of converions to Buick al drums and used serrated studs. It was difficult to find the right studs and drlll the right sized holes. I don't remember what studs I used. The serrated length was a problem. It is more of a problem as the stock drums are thinner. I used flattened lock washers to get the serrations positioned .