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Lock the micrometer securely in position (you can use a vise, just lay a rag over the jaws to protect the mic) and place your dial bore gauge in it. In this photo we’re only using one hand so you can see what’s going on better, but use two hands to hold the gauge steady. You will know you have the gauge square in the mic when you get the smallest number. This will tell you the clearance between the journal and the bearing.