I've added the 6 recessed grub screws. This is not a fun task, but after a while of straining my eyes and a bit of foul language as the tiny screw heads I made went flying and I got them done! Then realised one set of screws were too far back, so I filled them in and am going to re drill them.
They were fairly simple once I worked it out. I used a small bit in a pin vise, then cut a small length of styrene rod, used a craft knife to score the end, then glued it in the hole.

I also added the drainage hole in the bottom of the sleeve.
