I'm not sure what you call the slot in the back of the mast that you thread the mainsail through, so I'll call it a mainsail slot for now. There's an area where it's pinching together - perhaps due to the bungees that I use to hold it on to the trailer. As a result, it's getting harder to raise the mainsail. We broke a pulley and a cable today, and that may be related.

Is there a good way to straighten out the slot and make it a uniform size?

Jonathan