Chrysler Repair: Serpentine belt and idler pulley on a 95 Cirrus, stud bolt, degree deflection

Question
I've just replaced the serpentine belt on my '95 Cirrus (2.5L V6), and have spent the past 2 days on back trying to get the idler pulley tight enough that the belt doesn't slip, or flap while the engine is running.  Is there some trick that I'm missing? (The tightest I've managed to get it so far has allowed a full 90-degree deflection, far more than the recommended 1/4 inch)

Answer
I believe you have the type of tensioner that you loosen the nut on the pulley and then there is a bolt pointing towards the front of the car that is used to adjust the pulley back and forth.Here is what probably happened.If you take the pulley completely off you have the stud/bolt sticking out.That stud is attached to a little aluninum block which has a little knub/tit/bump(.Whatever you to call it.)that rides in the adjustment slot to keep it straight.Alot of times that knub will break off and thats why it won't adjust right.That part may be hard to find.What i have done is drilled a hole in and put a piece of a bolt,just long enough to keep it in line without the head on it.