I replaced the roller on my window regulators on my '51 and the replacement rivets were semi-tubular. They take a tool to secure them. You can get them from various sources. You just tap them with a hammer. Here's a picture.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.