This issue is a prime example of the fact that some people judge the facts by their theory instead of judging their theory by the facts.
We have solid, mutually corroborating eyewitness accounts, from three different locations, that there was a bullet hole in the windshield. Two of the witnesses were police officers. Two other witnesses were Secret Service agents. One witness was a medical student who went on to become the head of the surgery department at a major hospital in the Dallas area.
We have a highly credible witness, George Whitaker, who was actually involved in replacing the limo's windshield on 11/25/63 at the Ford Motor Company's River Rouge Assembly Plant in Dearborn, Michigan, and this same witness saw the bullet hole and was certain, based on years of relevant experience, that it was a front-to-back hole.
Whitaker said in a recorded 1993 interview that when he arrived to work on 11/25/63, the limo was already at the plant, in Building B, and that the windshield had already been removed. Two of the employees whom he supervised had been ordered to remove it, and they were given a cover story if anyone asked them what they did. He examined the windshield and saw the bullet hole. He added that the windshield was soon destroyed. Toward the end of his life, Whitaker produced a written statement about what he had seen and experienced on 11/25/1963.
We have support for Whitaker's account in the second-hand accounts of two family members whose father, Robert Harrison, worked at the Dearborn plant at the time and who told his family he saw a hole in the windshield. We have the fact that the logs for the White House garage show that no one came to see the limo on 11/25/63, whereas the logs show that people came before and after that date to see the limo. It would have been an easy operation to fly the limo to the Dearborn plant, have the windshield removed, and then fly the limo back to the White House garage in one day.
You couldn't ask for a more credible, solid witness than George Whitaker. Doug Weldon spends nearly three pages in his chapter on the limo talking about why Whitaker was a credible witness. Anyone who listens to Whitaker's 1993 recorded interview can't help but be struck by his sincerity and clarity. Whitaker never sought publicity, had no interest in the JFK case, and spoke on the record reluctantly and only at the urging of his oldest son.
Whitaker's account explains why the windshield in the limo on display at the Henry Ford Museum in Dearborn has no hole in it. Whitaker's account shows that all those witnesses who reported seeing a hole in the windshield were not "mistaken." The windshield in evidence is not the original windshield. It was replaced on 11/25/63. It was replaced (1) because the Secret Service was aware that many witnesses had seen the windshield hole while the limo was parked outside the ER entrance at Parkland Hospital, and (2) because the Secret Service knew that if any independent experts examined the original windshield, they would realize the hole was made by a missile that entered from the front.