After reading through the previous thread, I'm thinking the headstock bearings are too loose. Mine is doing a shake if I take my hands off the bars, and I'm betting that's the cause.
Again, so sorry about your off, and I hope you mend quickly. And hope you're insured.
Something I picked up from Cycle World, I believe: Jack up front end, and it should take somewhere near 1 lb pressure to move the front end side to side. Does this sound near correct? Faulty old memory banks.