round column solution

[Ian S C]

There was a mod article in ME, maybe in the 1990s, there may also have been one in MEW.  The one I'm thinking of had a fitting on top of the elevating gear box, and used the side of the rack as the guide (can't remember) maybe a ball race each side of the rack.
                                     Ian S C

[Arbalest]

That sounds like a good idea Ian.

[techonehundred]

Another forum had a try at this.  Here is the link.

http://bbs.homeshopmachinist.net/threads/48144-Round-column-mill-guide-bar-alignment/page4

[Mr Moo]

All very excellent.  The first of several modifications to my new warco 30......