A thought occurred to me yesterday while trying not to trip over the thing in the shed.
The throttle cable runs into the tubular handle through a small hole about a foot from the open top end, runs right down the handle, and emerges again towards the bottom through another small hole.
How the flip did they get it down the one hole and out the other? Was there a special tool? An employee with extra-long fingers, and production ceased when he retired? Or am I missing the blindingly bleedin-obvious again?