I've employed the "Swedish" approach and Dennis' home-made tool approach. Both worked just fine. It's all a matter of what you feel comfortable with. The former technique can indeed be dangerous($$$$$ gone). The later is much safer. You just have to be REAL sure that your cheater bar is going nowhere AND that the IGNITION is DEAD!. Some will tell you to kill the fuel system. That ain't good enough because there "might" be enough fuel left to start the engine. It can get ugly.
I like the home-grown tool.
1991 300-SEL - Model 126
M103 - SOHC
James Madison - Oppressors can tyrannize only when they achieve a standing army, an enslaved press, and a disarmed populace.
Liberty Firearms Training - After years of trying to regulate California criminals with a never ending stream of gun control laws they have still not given up with the belief that if they make something a crime that criminals will miraculously start obeying the law.