F1 frame counter

Hi everybody. I got a small problem with my canon f1. The frame counter isn't counting. I've opened the back a couple of times. Loaded it and reloaded it. It seems to me I did have trouble rewinding the film after the first roll and maybe something broke. Don't know for sure because I immediately reloaded it but never paid any attention to the counter.
If its an easy fix I'll fix it. If its not then I don't know what I'll do. I know I can just shoot it until the roll is done but its nice to know where I'm at when I'm using it.

Throw a motor on it, and use that frame counter (though it counts down instead of up). I believe this advice holds equally well for either era of F-1.

Duncan