Man, that's a work of art. 

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I'm just trying to sort out what you are calling the "h55 rear nose cone" to perhaps offer some help
Can you circle it here?
View attachment 2467219
i’m referring the the black portion on the back of the h55 (i guess it’s not a nose cone. bad terminology). it’s leaking underneath at the junction between the main body of the transmission and the black cover over the 5th gear. where the red arrow is pointing. just the underside of itView attachment 2467367