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Sorry, no bottom pix, but if I recall it was a '4pt tunnel'.
Don Saulsbury, western NY runs it now with a 4-60.

Tim; -is this one of the 'DELTA IIs' ?
I think you were trying to sell it to me that day ;)

Tim; -while we are on radical DeSilva designs, what is this,
a hydro or runabout, legal?, apparently called a "wedge"?.