Operated on my Olympia Splendid 66 tonight. Some keys stopped before making it to the platen. This grooved metal piece (not sure what it's called) wasn't aligned. Rather than sliding into the grooves, the typebars hit the raised tongue portions of the metal. It was really hard to get to. Though it now works again, I need to find out how to secure this grooved metal piece so that it doesn't get out of place in the future.