I agree with all Chimbu has said above.
Nut torque on the king post of the scott T/W unit is critical to minimising shimmy. The later McCauley units have a series of compression spring around the T/W head, that apply friction to the fork to stop it from shimmying.
To stop it, if it starts, requires you to remove load from the T/W by polling forwards(185 etc). It is worse on the tar.
The 210 is also a bit prone to shimmy. Keep dampers and any associated links in good order. If it occurs, apply back elevator and remove the load.
If left unchecked, potential damage would be substantial.
On the 185, you cannot keep your feet on the pedals if the shimmy gets going.
185.