wrote:
From looking at it, I am pretty sure this ain't it. The $70 adapter is
a custom cable for a particular device, the trafficscope. for what I
want, one end would have to be the lemo, the other end of the adapter
would need to be one fat plug and one thin plug.

The phone plug adaptor shown has three bands like a helicopter plug.
This would plug into the Y-adaptor mentioned with the familiar phone and
mic plugs.