It was kindly pointed out that I had the expansion links fitted the wrong way around. Thankfully they were screwed in from the back to a relatively easy fix, but it also gave me the opportunity to correct something that I had been too lazy to do until I had to unsolder the forked end to swap the expansion link around.

It’s not really visible in the photos but the pin that goes through the radius rod to connect the links which attach it to the reversing gear is flush on the photos in the earlier shots. It now has a protrusion to represent the end of the retaining pin. Which was present all along, but on the inside. This was due to my swapping the radius rods over to get them to better align with the top of the combination lever.