Hi Matt,Did the same on my Colchester Student, a few weeks ago, did the SC box as well because it was stiff, ended up taking the front off the SC box, because it was so full of sludge, and found a circlip and spacer in the bottom, which was jamming the detents, cleaned it out, found where they were missing from, and replaced them and put the front back on, what a difference, then took the lid off the main gearbox, another circlip and a spacer, plus the original drain plug, all floating around in the bottom of the gearbox, Haven't found where they came from yet, but have a good idea, and they will be put back as soon as I get back on the machines. At the moment, the three phase is of, as I am rewiring with a new Dis board and want to get that finished, and then the last push is to rip up and re lay the main floor, but I get a crew in for that!! Nearly finished, only taken 3 years!