One thing that makes a dispro difficult to restore is that the hull
has to fit the device. Since the device is cast iron it doesn't
move , and if the hull doesn't fit the device it's likely that
the garboards will split when the bolts are tightened into the device
. I made a plywood template to match the bottom of the device casting
. While I was making it , it was interesting to note that both sides
of the casting aren't the same . The pattern is temporarily screwed to
the keel while the planks are fitted.
Where the stem and stern post meet the keel , a small wooden dowel
called a stop-water is fitted . The idea is that if water tries to
creep up the joint , it will cause the dowel to swell up and stop the
The Garboard planks ( the ones beside the keel ) have quite a bit
of twist in the ends , so they are steamed and twisted to shape at the
ends . After the planks cool they will be nailed in place .