75 degrees c in the oven for 15 minutes, swift hands with a flate bladed screw driver to pop the bkac clips (they will be soft and very easy to move), pry the lens in a perfectly vertical position about 20cm....alow the glue to cool, then carry on, prevents any sticking to the inside of the lens and breaking out the shellite to clean the crap off. If the glue starts to cool too quickly, stop what you're doing and put them back in the oven for round two. Have your calm pants on that day.