A steel angle was installed on the outside of the east wall to spread the load from the turnbuckle assembly over the top plates and several second-floor joists.
The author threaded the needle beams under the structure, resting the ends of the beams on the cribbing. Blocks set on a lower tier of cribbing supported the jacks while the crew raised the needle beam until it made contact with the 6x6 support beams under the floor.
Bottle jacks did the lifting, and screw jack sheld the needle beams while the bottle jacks were repositioned.
The existing 6x6 support beam on the west side of the boathouse developed a sag as the needle beam was raised, so the crew we added smaller, less elaborate supports at two other places along that side.