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The Hunley Torpedo Deployment Forum files are no longer on line -- nor are they on this computer or its attached 320GB HD. If I can find them on another laptop or on backup CD(s), I will share some other images with you:

Scale CAD drawing of the Housatonic's hull cross-section at the point of explosion -- with the Hunley in attack position, 2-4 feet from the Housatonic and "barely awash" -- and the 30-degree downward-angled 18 foot spar.
Sketch of the predicted "Y-yoke" hinge mount for the spar (at the bottom of the bow) -- the as-found mount was virtually identical. (FWIW, the nut on the pivot bolt actually unscrewed -- after over a hundred years in salt water...)
Enhanced period images of the Hunley on the dock (for refit, following the second sinking that killed H.L. Hunley) -- showing a pivoting spar-attachment at the actual location.

FWIW, much of our info on the relative positions of the vessels during the attack came from the records of the Union Navy's Court of Inquiry called to investigate the sinking of the Housatonic...

I'll see if I can find anything else to share...

Too bad the "slavery haters" have hijacked this otherwise historic and academic thread... :-(

I just found a couple of the Hunley Forum images:

Early estimate of the blast area (shown on a model of the Housatonic). Later revised to a slightly farther astern posiiton,

Chapman's sketch of the Hunley during refit after the second sinking. Clearly shows the Y-yoke pivoted iron rod (over which the tubular spar fit) angled down and resting on the dock. Observe that (in this view) there is nothing affixed in the upper hole in the bow casting...

Function of the protrusion(s) midway up the bow is still under debate...

The starboard diving plane has been removed and rags stuffed in the pivot-shaft hole. The forward hatch cover (subject of this article) has also been removed -- probably to facilitate the removal of the bodies of H.L. Hunley and the rest of the crew...