Tuner Issues w/Zenith H845

[tlavergne]

I have had a Zenith H845 radio for a year or two. It has been a great radio and it has become part of the family. Today as I turned the tuning dial it refused to move more than 1/8 of an inch in either direction (both the tuner and the indicator). I feel the same amount of resistance as I turn the dial as I usually do. It worked great last night. So, before I begin tearing into this radio I was looking for some advice for what it might be and how to fix it.
Many thanks.
Tom