Helo Cabinetman. To adjust the headstock bearings, which are angular contact bearings, you need to first remove the grub screw in the collar fitted on the outboard end of the splindle, watch out for the brass plug the protects the threads on the splindle and is fitted under the grub screw and may fall out when you move collar. The collar can now be rotated on its fine thread to either reduce or icrease the space between the bearings. If you can feel or preferabley measure endfloat on the spindle, gently tighten the collar until there is no perceptable endfloat, but no further, then replace the grub screw with the brass plug under it. Be very careful not to over do the preload on these bearings as you will shorten their life, if you feel you have over done this setting. loosen the collar and give the inboard end a gentle tap to achieve excess endfloat and the start again! Myford stress in their manual that this adjustment be correct to ensure maximum life from this bearing set. These bearings are huge and of high quality, they must be lubricated with light oil on a total loss basis, not grease.
I hope this helps regards Paul
