XC diff-locker

10 minutes with the Polymorph again. This time locking the differential.
Instructions as per those for my Sand Scorcher ball joint replacement. Basically thread the two halves of the diff case onto a small watchmaker's screwdriver (as a clearence hole is needed through the middle) and then squeeze enough Polymorph into the cavity and then squeeze the two halves together. Run under the cold tap and trim off the residue.