I have been going though my parts manuals doing some research and keep finding errors. Not just the magnetic pulley. Did you know 8N's had a tachometer?
Somebody went through the trouble to split the binding open and glue in a corrected page 131. They did a darn good job of it too, lined up perfect. But while they were in there they should have removed the page 131 that had the error. Anybody else have this in their May 1950 Parts Catalog?