Hi Edward,
These articles may contain the info you want. I have not looked at the articles them selves, but simply referred to my homeproduced database. They seem to refer to quill backlash elimination.
ME 19 May 89 page 621 & 05 Jan 90 page 51
MEW40 Jan 97 page 20
These articles refer to modifying a drill press into a cheap milling machine, hence may also help.
MEW33 Jan 96 page 12
MEW35 May 96 page 66
MEW92 Aug 03 page 52
Hope this helps.
Peter G. Shaw