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Look closely under the tunnel opening, there is a wood bar which was used
as a rock ledge to hold the base in place. You will stack the limestone the same
way I described on the last page. We glued a piece of wood and the rock
ledge to the supports for the tunnel. I used clay some 2 penny nails to hold it into place. If you look to the lower right corner of the picture, the wood plate would look like that with the exception of the upper bar. Other, pictures are
