Supplied in small numbers , the lenses are supplied pushed into the
mounts and again they don't say how to remove them without damage to the
lens.
First one bodged by placing over a couple of metal plates providing the
across-flats 12.9mm gap to then push down as detailed below. As stated
previously you lock the holder to the pcb in normal use, by pushing the
lens into the holder , so first they have to be separate.
Then with 1 free holder, place back-to-back castellation to castellation
over the next one. Place a flat piece of rubber into the slot part that
takes the LED (so not to damage the thin lens wall) and push down quite
hard with a rod, until the lens pops the 1mm into the precise recess of
the other holder. Remove the second holder by hand and then grip the
lens across the pre-existing mold marks and pull out from the first
holder with serrated edge pliers.
Well that is my method for Osram Golden Dragon lenses made by Polymer
Optics Ltd as supplied by RS