I saw this fix on Difflock from JAR126 : http://forum.difflock.com/viewtopic.php?p=530707&sid=821c9fd175296a3c9407932c8cfcdf5a
Buy one of these: http://www.diy.com/nav/build/doors-...Ball-Catch-Brass-Plated-9370752?skuId=9671457
Then using a hack saw cut off the lip that holds the ball in, drill through the end with an 8mm drill bit and shorten the body to 5mm. You'll be left with a top-hat type brass bush that replaces the nylon one perfectly.
Buy one of these: http://www.diy.com/nav/build/doors-...Ball-Catch-Brass-Plated-9370752?skuId=9671457
Then using a hack saw cut off the lip that holds the ball in, drill through the end with an 8mm drill bit and shorten the body to 5mm. You'll be left with a top-hat type brass bush that replaces the nylon one perfectly.