[stoney]

To answer your other question I used 3/8" plated allthread. I double nutted one side. After the big glue event with SLOW set epoxy the allthreads backed out no problem. I put an allthread everywhere there was a hole in the transom, like drain plug motor mount holes, drain holes etc. I will defer to others who know more about repairs and 20 foot seacrafts, BUT the knees weigh almost nothing. There are lots of other posts of people rebuilding the transom and putting them in. The point of all this work is to make the boat better and NEVER have to do it again. If you put the knees in drill through holes for drainage BEFORE installation.