I had some Barients on a previous boat and one of those froze up on me. I tried to get the drum off to see what what was wrong inside, but it wouldn't budge after I removed the top cap and split ring. Eventually, I CAREFULLY pried the drum off using a crow bar all around the base, with a thin piece of plywood under it to prevent marring the gelcoat. I found that one or more of the pawl springs had disintegrated and tiny pieces of them were in the race over the spindle preveting anything from turning. It took hours to pick them out,sometimes using tweezers, but mostly a stiff bristle brush soaked in mineral spirits. After cleaning everything up and greasing the parts, I replaced the missing springs with those from a Lewmar kit (Barient parts are hard to find), slipped the drum back on and was back in business. This may be the cause of your problem.