As requested, the mounting bracket..


The plate is 10mm brazed to a short length of 20x20 to suite the size of the tool post.
The shallow holes are to clear the screw heads on the grinder (yes, I know one is way out of place, but it is still close enough).
Two 5mm grub screws keep it attached.
The lathe runs in the normal direction and the sparks go upwards.