[Chas]

FWIR the knob is Dakaware brand. It is a solid Bakelite knob with three threaded holes to mount the cursor. There are plenty of images of this bridge that can be found with a Google search. Simply estimate the taper and width based on where the edges of the cursor appear in relation to the dial scales. There is a scribe line on both sides of the cursor, because it is transparent the lines help to eliminated parallax error. Thus, the cursor can be as thick as desired, so long as it is scribed & inked on both sides.

GL

Chas