The pics are a bit hap hazard (and VERY BIG) but in essence I cut a hole in the clear reflectors, using a soldering iron, then trimmed up the edges. I removed the led pcb from the old light units I had and stuck it into place over the hole in the reflector using mastic. I then fitted the rear cover of the lamp unit over the pcb on the reflector and stuck it into place using mastic again, making it water tight and hey presto. What do you think good, reasonable or crap (you wont hurt my feelings)