Shimano SLX front derailleur gives up the ghost

My front chain ring shifting has been decidedly dodgy for a week or two and on Sunday morning it more or less packed in. On inspection I discovered that a pivot pin had worked its way out putting excessive pressure on the main alloy cast pivot point with the result that it had broken. Ever the tight wad I managed to source a Sram X7 front derailleur at about half rrp and after a quick 11.5 miler tonight my front gear changes are back to normal.