Threaded fork/headset problem

700c hybrid with steel fork and 1" (i think) threaded headset. The locknut won't stay locked. I replaced the locknut and this improved matters but looks like the fork threads are gone too. Even tried taking out the thin washer between locknut and ajustable cone. Options? Will threadlock compound sort it for a while? get a new fork? Some sort of adapter to take a new-fangled threadless stem?
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Reading the info on threaded headset service on Parktools would help.
Parktools :?:SheldonBrown
Parktools :?:SheldonBrown
You could get the headtube faced to reduce the overall height and thus make the steerer long enough.