These rollers are not under a lot of pressure. No need to employ nuclear plant technology to set them.
I just use a fat center punch which has a large cone below the point which works well for spreading the hollow end of the rivet.
I set it up on a hard level surface to support the head of the rivet and hit the punch until it mashes the hollow rivet into place. I them mash the rivet some more so that the petals of the rivets are flush. The petals will not likely be symmetrical, but they will never come out or get loose.
Just my 2 cents, which will not even buy one piece of "penny candy."
