I think I've fixed (at least for now) the problem. I recently bought this table locally, and basically took it apart and reassembled it. What I thought was the motor making the tapping noise, ended up being a lack of bearing oil in the sub platter well. I had nothing to go by as far as how much oil to use, but apparently I didn't put enough into the bearing well. I added about 15 more tiny drops, and the noise went away. It seems that the bottom of the spindle was grinding a bit against the ball bearing. Try adding a few drops at a time, then place the platter back on and give it a run. Don't forget that each time you remove the sub platter, it will remove some of the oil since the bottom of the spindle will be covered in it!
