Rear indicator lens stuck.

[ELIMINATOR]

I've just received a pair of second hand rear indicators in the post. One is working, the other isn't. I've removed the screw. the lens is reluctant to come off. I recall breaking a rear indicator lens in the past by being ham fisted. How does it come off?

Stupid question really, I just don't want to break it.

[ELIMINATOR]

Sorted, I put an Allen key in the screw hole, tapped the key and the lens came off