Howdy.
Here's a tip for anyone replacing lower ball joints. I ripped out and polybushed the lower arms along with a load of other stuff a while back. Reassembled everything with new joints etc. and as I had my torque wrench out, decided to do it all properly and look up the settings in the Haynes manual. I thought the figure for the three bolts holding the lower ball joint to the wishbone seemed low. About a week after having the track and camber set, the dreaded clonk returned. On inspection the offside joint had two loose bolts and one missing. Have now done em up with a 13mm ring spanner good and tight - so much for doing it by the book!