Detail: Usually I lock the adjustment bolt near the center of the adjustment spectrum. This event has suddenly occurred since my last tune-up, approximately 10K miles ago.
Solution: The only way that the adjustment can be so far out is that the distributor was pulled and reinstalled 1 tooth out , Hi, A 6ya expert can help you resolve that issue over the phone in a minute or two. Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US. The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones). click here to download the app (for users in the US for now) and get all the help you need. Good luck!