This is my rendition.
http://farm4.static.flickr.com/3310/...b13e5d6c_o.jpg
http://farm4.static.flickr.com/3384/...c5fcd477_b.jpg
It was made or put on a sticker and physically stuck to the lower side of the base/bearing.
Cut a hole/slot in the top part of the base to look.
I am yet to put a laser/LED pointer on it yet.
Care of
http://settingcircles.robertwillett.com:8000/
It is a bit technical, if you are that way inclined, as I had issues of printing it out on A4 (it comes in a huge paper size PDF/TIFF).
But I also had to turn the numbers around 180 degrees (I think by memory), as I wanted to view the numbers from the EP area, not lift head from EP, turn head 90 degrees to right too look at the numbers.