Jelco is drilled thru with no arm board.
spindle to pivot is 240mm
does anyone know a better tone arm that would have that 240mm so I could mount it in the same location?
Same PS distance does not mean the same diameter of the mounting hole in your plinth. It can be wider or smaller than your current hole.
If you can modify the mounting hole a bit, you could use Fidelity-Reseach FR-64fx tonearms with 230mm PS distance and 30mm mounting hole diameter. Superb tonearm!