The drawings below show the operations necessary for you to accomplish this yourself. The column and saddle may also be returned to the factory where these modifications will be done for you. Pricing for the modification is as shown below. For use in normal milling, the two parts of the milling column can be taped back together with black electrical tape to keep them in register. Modification to Column Saddle on Older Machines Mills manufactured since 1993 have two perpendicular slots milled for the alignment key so that the headstock can be mounted in vertical or horizontal alignment.
Older machines have only the vertical key slot.
The drawing in Figure 3 shows the dimensions of the additional slot so you can machine it into your saddle. The newer column saddles also have a laser engraved angle scale imprinted on them. This makes it easier to reference approximate angles for rotating the headstock to do angle milling. If you wish to purchase a new mill column saddle rather than modify your old one, order part number 4504. Milling a second keyway slot in the Mill Saddle on machines made prior to 1993.