Mitsubishi Repair: timing belt, sprocket, eclipses

Question
where is the silent shaft hole located

Answer
Chuck,
I have no idea what car you're referring to, so it makes it difficult to give you much information.

But for DOHC engines in Eclipses, there are two silent shafts; one is located near the front of the car (left of crank sprocket), and the other is to the right for the crank sprocket.