problem-glowplug cable jammed off 1975 240d

[robc]

any suggestion would be appreciated
i pushed the cable in for the glowplug/starter/off cable, well i can't get it back out and therefore can't get it to start, or stop for that matter, its currently in a stuck in or off position, in the manuals i could find some info re this, and it starts by removing the instrument cluster. its stuck in really hard, i have pulled the knob completely off, and even with vice grips and all the effort i could muster, i could not pull it back out.

i traced the cable from where it hooks to the engine to where it comes thru the dash,