Remove centerboard on trailer
I changed my centerboard uphaul to a low stretch Spectra line on my '94 H-26 last year. I put a 4x8x12' piece of lumber under the boat just forward of the centerboard, and just past the trailer end where the hull is still flat. I cushioned the contact points with old carpet and made a V-cradle from lumber scraps. Then, using two hydraulic jacks, I slowly raised the front and the back, keeping the boat level. When moving the jacks I replaced them with cement blocks. You only have to lift the boat about a foot. However you lift the boat, hook a light line to the uphaul line so that you can pull the line back up later. It makes installation easier. The rest is as others posted, remove the bolt under the table and the whole assy. drops out. Make sure something or someone is there to catch it. We have done this with 2 boats now, just remember to put blocking in the middle of the beams before you crawl under the boat, and if you expect winds, some 2x4 side supports might be in order to stabilize the hull. Other than the expense of the wood this is not an expensive project. On the second boat, which is slipped, we did the bottom paint also, and it is not possible to do the trunk area without removing the centerboard.