The last coulpe of times driving my 450slc I've notice there is a looseness in the wheel. When the car is stationary and I grab the wheel at 12 and 6 o'clock position and pull it towards me there is about an 1/8" give and take. If I turn the wheel slighly to the left and right I hear and feel a slight knock. I don't think its in the coupling as I don't have hardly any play in the wheel. I feels like its the column itself. I haven't taken the steering wheel off yet, but I'm thinking maybe the shaft nut is loose. Anyone know what else it could be?