Door Mirror Tripod Snapped

[jesusbuiltmycar]

One of my door mirror tripods has sheared off and I cannot work out how to remove the it before sourcing a new part - It looks like there is a hex-key grub screw inside but there is no way to get one in there (without heavily modifying the hex key with an angle grinder).



Can anyone tell me the best way of removing the old tripod? If I need to modify a hex key to make a special tool can anyone let me know what size the hex key is?