Cheers for the help guys, I'll just have to hold the job off for a few days while I wait for the set to arrive. Good job really because I dropped the 6mm one while inspecting it and not found it yet, they have some spring in them ;)

It seemed like it may have tightened but the nut ran out of thread before it had a chance too. Not too worry, I'll be up and running soon enough.

Thanks