I hated this job, it was a pain in the arse 'til I had a rush of shit to the brain. Cut a piece of wall plug, split the side so you can get it off and push the spring down and hold it tight with pliers. You can then turn the mounting bolt without damaging the thread and without growing an extra arm. Forgive me if this is obvious but I just had to share my joy at solving a problem that used to drive me nuts. :blob7: