Macgregor 25 poptop
Nicely equipped pop top boats have lift springs (like those that hold up the hatchback on your minivan) to help raise it up. Don''t know if your boat had them originally or not, but they would not be too hard to add or replace if the ones you''ve got are beat. Here''s a set designed for catalina 22 or 25:
But with a little ingenuity you could probably get a set from the local auto parts store and adapt them to your boat.