Re: Boat registration
I hate to say this, but you will likely need a signature from a probate judge. Look up your local probate court, it will be a division of county government, and speak with the judicial assistant. In small jurisdictions the bailiff may also serve as assistant.
Depending on how user friendly your courts are, you may be able to get directly in front of the judge. If you live in a large county like Franklin, you will never get near the judge and the issue will be handled by court staff.
I would give it a try on your own and then call a probate lawyer if you do not have success. If money is a problem call the nearest law school and see if they have a pro-bono program.