[cactusjack]

There's a procedure for properly tightening the handlebar clamps. "tight as possible" isn't it. I no longer have a Nomad service manual, but if I remember correctly, you torque the front clamp bolts to 25 ft/lbs, then torque the rear at 25 ft/lbs. The clamps should not sit level, they should fit flush at the front with a small gap at the rear. If this has been going on for some time, it's possible the knurls on the bars have worn down or worn the clamps themselves.