Mike, I assume you mean the topping lift? Is yours adjustable? When I bought mine it was not - the PO had rigged a wire rope with cable clamps to a fixed length. I retrofitted mine with a small swivel block and a line through the boom. While you have solved the problem of the pockets opening, I wonder if the lift is fraying your sail - if so, perhaps making it adjustable would help. I set mine so it is tight enough under sail to not flap on the sail, yet not so tight it prevents the main from fully supporting the boom.