Replace Starter Motor

What happens here

The owner attempts to diagnose the starter issue further. He gets underneath the truck and attempts to manually tap the starter solenoid with a wrench, but it doesn't resolve the problem. Recognizing the complexity of the issue and the age of the starter, he decides to replace it. He lays down cardboard to work on. He removes the old starter motor, which takes him 12 minutes and 46 seconds to detach. He notes that he found two of the three bolts relatively quickly.

Goal: Resolve the starter engagement issue.