New tires & front brake pads - (ME880/BT020). Now I've got a slight front wheel shimmy, noticeable when I first start moving. Didn't feel it before the new tires. I've checked the wheel & the brakes, both appear OK. However, the steering damper doesn't have any resistance when I turn the wheel. Is this the likely culprit? I assume I should feel at least a little friction. Is this unit rebuild-able?