Binding Hands?

My oversized wall clock keeps stopping. I thought it was the battery so I went and bought a Duracell. Now I noticed...after it stopped again, that the hands are touching. The clock works fine for a few hours and then it appears the hands get stuck on each other. I'm going to take the back off the clock and see if I can remedy this. Is there anything I should know before I do this.
Thanks for the help