another DW discussion...
Riddle me this.
Damn near anything in the frontend can cause deathwobble. A steering damper
will not fix it. It will only weaken it or hide it, and it WILL come back when either the damper wears out somewhat, or the suspension gets looser and the damper is no longer enough to cover it up.
Basically, your suspension is theoretically equivalent to a pendulum, ... frequency dropping far enough that the suspension only experiences that frequency at low enough road speeds that deathwobble is more of a shimmy that only happens a few times before dying out (overdamped.)
in before "what's the frequency, Kenneth?!"