The following has worked for me:
Place a wrench on one of the bolts securing the pulley and turn clockwise as if to tighten the bolt. This will serve as a counter. Now place a wrench on another bolt and loosen it. You'll eventually have all but one bolt loose. Use one of the now loosened bolts as a counter, then loosen the remaining bolt. Any that need to be reloosened may now be done by merely grapsing the pulley from underneath with a firm grip and loosened with a wrench.
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.