I just bought a 1984 Mercedes 300DT. It runs great, but now the key will not turn out of the 0 position. I have been advised by the technician at the Mercedes helpline that the only way to remove the lock cylinder is to drill it out. Can someone tell me how to do that?

96 Geo Metro, 114k+, 1.3L, Manual ,Teal,Gray Int, 4 Wheels So where to start.. many fold as I said.. Assuming that the ODBll scanner is working correctly I may be getting a Manifold Absolute Pressure Sensor whacko warning. Which leads to the test according to CHiltons manual.. 5volts with key on not started then 1.1-1.3 volts after engine running. Well I got the 5v but then 1.5v after I started it. My question is could this be a 'false' positive? Not really the MAPS ($90) but could it be catalytic blocked (looks original) to cause to much pressure. Book says low voltage is low manifold pressure OR high engine manifold pressure ( clarify the difference if you could) which leads back to higher voltage corralates to vacuum decreases and the pressure goes up (according to my CHiltons). Neglected to give "problem", gas usage has increased dramatically and it kind of 'stumbles' when acclerating. Slight hesitation at highway speeds once up to 55 but seems to run 'alright' once at cruising speed. Changed fuel filter,air, pcv,plugs,rotor,dist cap,tranny fluid(don't ask why), oil of course, I just recently bought this vehicle and ran great for about month or so then got this check engine light and these other problems... I know I always forget something but... Joe is kind enuff to remind me :)