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Grego:
Eliminating the rack and pinion as a source of play would be a good thing.

If that does not do the trick, then pick Bob in CT's brain. Bob has been working (obsessing) on this monkey for at least a year now and he has tried just about everything. He also has some real data as to which things pay off and which do not.

It may appear that some individual tires are just "crap" oddballs, being out of round and beyond reasonable balancing and shaving cures.

I personally, took my tires and rims to a local shop with the new Hunter machine and breaking the tires and rotating them on the rim to minimize the effects along with a series of balancing did the trick for me.

However, none the less, if I drive the Cobra at about 75 MPH, if I hold the wheel loosely I can feel JUDDER. If I hold the wheel with a tight grip, then no JUDDER.

Odd but true.

How do you hold the wheel??