I've owned several sets of K-H discs over the years. Never saw a swaged stud on a set. Since both the rotor and hub have enough cross section and the stud is a press fit it is not necessary like it is with drums.
I had a couple sets that were swedged. They do not look like drum swedges. One set was on a low mile 72 Duster 340 that was totaled and another set I picked up somewhere else. Not sure why or when they did it. It is real easy to tell. If you can not see the hole and chamfer where the stud comes through to the outside of the hub, the swedge is covering it. My front end guy warned me, that's how I first noticed it. Everyone can decide for themselves if and how they proceed. My machine shop added the swedge back on a set, there is enough material on the studs. I'd rather they didn't but I'll worry about it probably 20 years down the road.
