Brain surgery on a Festool router. Pray before trying this at home. Seriously, near the end where he tackles cleaning the depth stop turret: why did he spend the time instead of simply buying a new one?
http://www.floweringelbow.co.uk/2010/fixing/look-inside-a-festool-router/
http://www.floweringelbow.co.uk/2010/fixing/look-inside-a-festool-router/