Somebody clipped my n/s wing mirror in a carpark last week. No serious damage, fortunately: the cap was dislodged but clipped back in; however the transparent plastic indicator insert has fractured where it projects. A replacement costs about £20+. Does anybody know if it can be 'popped' out and easily replaced, or does the mirror and cap need to be removed first?

The indicators are usually held in by a torx screw, you will need to remove the mirror lens (and possibly the motor) to gain access to it.