Time for another ribbon change. My Silver-Reed Leader II is next on the list to receive a fresh ribbon, as it is a Seiko derived machine the process is fairly painless and just involves removing the old ribbon spools from their holders and lifting the ribbon from the machine. Then placing the new ribbon spools on the holders, making sure the hole is aligned with the prong so the ribbon will be advanced when you type.
The only fiddly bit is making sure the ribbon is correctly threaded through the ribbon holder assembly so that when you type the type bar hits the ribbon and then the paper. I can happily report the Leader II now types nice and clearly again, in both colours.