blocks

I am planning a project to bring my halyards back to the cockpit from the mast, which means two stand-up spring blocks and two deck organizer type flat blocks. However, the section of the deck where I'd be installing this stuff is ...actually not sure how to describe it, but there's a "cavity"...

Hi - Newbie Sailor Here... I have a 1972 MacGreggor Venture 21 currently in a slip - but come mid-October, I'm going to put it on its trailer for the winter. As I want to work on the keel over the winter (it has a swing-keel), I'm wondering if anyone can tell me how I might be able to lift it...