Of all the hints and tips I have seen over the past months, no one has mentioned
a sticky pin! 
The humble sticky pin is invaluable for finding the centre of components in the milling machine.
Just a handy pointer, made from a length of wire and a piece of blue tac, or plasticine.
Stick it onto any hand rotatable spindle part........




And when you`ve done with it, for now.......

It sticks onto the machine, so it doesn`t get lost!

David D