Fill all old fastening holes in garboard rebate. Scarf in additional width to forward end of garboard (in two sections). Mount garboard and first plank and mark overlap. Remove first plank and cut lower edge to remove timber damaged by previous refastening efforts. Remount and mark garboard for trimming. Repair first plank as required. Remove garboard, cut to size and dress top edge. Fit and permanently fasten garboard as per post side. Final fit and permanently screw first plank at ends and into floors.
First plank: mount, mark, trim and repair as per starboard. Trim and dress garboard in situ. Seal any old fastening holes and gaps as required. Fit and permanently fasten.