Here is a picture of the one for my SB13. Note the relief groove, plenty of room for the spindle to park.?

This is a schematic I found on the internet, it is what I used to make mine. I don¡¯t know who to give the credit to for it, or I would.

Here is some info that is posted on this site about the gears needed to do metric threading on a SB9. ?

Something I like to do with info like this is print it out, laminate it, and keep it with my lathe tooling, so I can always find it again.