If you have the quill out of the head casting, you can press the spindle out the bottom. After you remove the 2 spanner nuts and lock tab, support the quill with a piece of pipe about the same diameter- then just press the shaft out- be careful you don't hook the race of the lower bearing on you support pipe or it will pull it apart and ruin it. Once the spindle is out, the lower bearing can be cleaned and inspected for any damage- if it looks ok, it can be re-packed in place with a good moly grease. The top bearing will come free and it can be cleaned, inspected and repacked or replaced. The bearing numbers are listed on the Shoptask website
www.shopmasterusa.com under the " common parts" tab.